diff --git a/client/src/actions/login.js b/client/src/actions/login.js
index da0ccaa1..7cd14692 100644
--- a/client/src/actions/login.js
+++ b/client/src/actions/login.js
@@ -54,6 +54,13 @@ authenticateWithOidc.failure = (error, terms) => ({
   },
 });
 
+authenticateWithOidc.debug = (logs) => ({
+  type: ActionTypes.WITH_OIDC_AUTHENTICATE__DEBUG,
+  payload: {
+    logs,
+  },
+});
+
 const clearAuthenticateError = () => ({
   type: ActionTypes.AUTHENTICATE_ERROR_CLEAR,
   payload: {},
diff --git a/client/src/api/access-tokens.js b/client/src/api/access-tokens.js
index 5b423558..426c0501 100755
--- a/client/src/api/access-tokens.js
+++ b/client/src/api/access-tokens.js
@@ -13,6 +13,8 @@ const createAccessToken = (data, headers) =>
 const exchangeForAccessTokenWithOidc = (data, headers) =>
   http.post('/access-tokens/exchange-with-oidc?withHttpOnlyToken=true', data, headers);
 
+const debugOidc = (data, headers) => http.post('/access-tokens/debug-oidc', data, headers);
+
 // TODO: rename?
 const acceptTerms = (data, headers) => http.post('/access-tokens/accept-terms', data, headers);
 
@@ -24,6 +26,7 @@ const deleteCurrentAccessToken = (headers) => http.delete('/access-tokens/me', u
 export default {
   createAccessToken,
   exchangeForAccessTokenWithOidc,
+  debugOidc,
   acceptTerms,
   revokePendingToken,
   deleteCurrentAccessToken,
diff --git a/client/src/components/common/Login/Content.jsx b/client/src/components/common/Login/Content.jsx
index 29d35963..03904133 100644
--- a/client/src/components/common/Login/Content.jsx
+++ b/client/src/components/common/Login/Content.jsx
@@ -8,7 +8,8 @@ import React, { useCallback, useEffect, useMemo } from 'react';
 import classNames from 'classnames';
 import { useDispatch, useSelector } from 'react-redux';
 import { useTranslation, Trans } from 'react-i18next';
-import { Button, Divider, Form, Grid, Header, Message } from 'semantic-ui-react';
+import TextareaAutosize from 'react-textarea-autosize';
+import { Button, Divider, Form, Grid, Header, Message, TextArea } from 'semantic-ui-react';
 import { useDidUpdate, usePrevious, useToggle } from '../../../lib/hooks';
 import { Input } from '../../../lib/custom-ui';
 
@@ -23,7 +24,7 @@ import logo from '../../../assets/images/logo.png';
 
 import styles from './Content.module.scss';
 
-const createMessage = (error) => {
+const createMessage = (error, isDebug) => {
   if (!error) {
     return error;
   }
@@ -82,7 +83,7 @@ const createMessage = (error) => {
     default:
       return {
         type: 'warning',
-        content: 'common.unknownError',
+        content: isDebug ? error.message : 'common.unknownError',
       };
   }
 };
@@ -95,6 +96,7 @@ const Content = React.memo(() => {
     isSubmitting,
     isSubmittingWithOidc,
     error,
+    debugLogs,
     step,
   } = useSelector(selectors.selectAuthenticateForm);
 
@@ -124,7 +126,11 @@ const Content = React.memo(() => {
     return initialData;
   });
 
-  const message = useMemo(() => createMessage(error), [error]);
+  const withOidc = !!bootstrap.oidc;
+  const isOidcEnforced = withOidc && bootstrap.oidc.isEnforced;
+  const isOidcDebug = withOidc && bootstrap.oidc.debug;
+
+  const message = useMemo(() => createMessage(error, isOidcDebug), [error, isOidcDebug]);
   const [focusPasswordFieldState, focusPasswordField] = useToggle();
 
   const [emailOrUsernameFieldRef, handleEmailOrUsernameFieldRef] = useNestedRef('inputRef');
@@ -157,14 +163,11 @@ const Content = React.memo(() => {
     dispatch(entryActions.clearAuthenticateError());
   }, [dispatch]);
 
-  const withOidc = !!bootstrap.oidc;
-  const isOidcEnforced = withOidc && bootstrap.oidc.isEnforced;
-
   useEffect(() => {
     if (!isOidcEnforced) {
       emailOrUsernameFieldRef.current.focus();
     }
-  }, [emailOrUsernameFieldRef, isOidcEnforced]);
+  }, [isOidcEnforced, emailOrUsernameFieldRef]);
 
   useDidUpdate(() => {
     if (wasSubmitting && !isSubmitting && error) {
@@ -269,16 +272,27 @@ const Content = React.memo(() => {
                 </>
               )}
               {withOidc && (
-                <Button
-                  fluid
-                  primary={isOidcEnforced}
-                  icon={isOidcEnforced ? 'right arrow' : undefined}
-                  labelPosition={isOidcEnforced ? 'right' : undefined}
-                  content={t('action.logInWithSso')}
-                  loading={isSubmittingWithOidc}
-                  disabled={isSubmitting || isSubmittingWithOidc}
-                  onClick={handleAuthenticateWithOidcClick}
-                />
+                <>
+                  <Button
+                    fluid
+                    primary={isOidcDebug ? undefined : isOidcEnforced}
+                    color={isOidcDebug ? 'orange' : undefined}
+                    icon={isOidcEnforced ? 'right arrow' : undefined}
+                    labelPosition={isOidcEnforced ? 'right' : undefined}
+                    content={isOidcDebug ? t('action.debugSso') : t('action.logInWithSso')}
+                    loading={isSubmittingWithOidc}
+                    disabled={isSubmitting || isSubmittingWithOidc}
+                    onClick={handleAuthenticateWithOidcClick}
+                  />
+                  {debugLogs && (
+                    <TextArea
+                      readOnly
+                      as={TextareaAutosize}
+                      value={debugLogs.join('\n')}
+                      className={styles.debugLog}
+                    />
+                  )}
+                </>
               )}
             </div>
             <div className={styles.poweredBy}>
diff --git a/client/src/components/common/Login/Content.module.scss b/client/src/components/common/Login/Content.module.scss
index e1bbd88f..d0f7ad61 100644
--- a/client/src/components/common/Login/Content.module.scss
+++ b/client/src/components/common/Login/Content.module.scss
@@ -19,6 +19,16 @@
     width: 100%;
   }
 
+  .debugLog {
+    border: 1px solid rgba(9, 30, 66, 0.13);
+    border-radius: 3px;
+    color: #333;
+    line-height: 1.4;
+    margin-top: 16px;
+    padding: 8px 12px;
+    width: 100%;
+  }
+
   .divider {
     font-weight: normal;
   }
diff --git a/client/src/constants/ActionTypes.js b/client/src/constants/ActionTypes.js
index f26e5fe8..a947e279 100644
--- a/client/src/constants/ActionTypes.js
+++ b/client/src/constants/ActionTypes.js
@@ -29,6 +29,7 @@ export default {
   WITH_OIDC_AUTHENTICATE: 'WITH_OIDC_AUTHENTICATE',
   WITH_OIDC_AUTHENTICATE__SUCCESS: 'WITH_OIDC_AUTHENTICATE__SUCCESS',
   WITH_OIDC_AUTHENTICATE__FAILURE: 'WITH_OIDC_AUTHENTICATE__FAILURE',
+  WITH_OIDC_AUTHENTICATE__DEBUG: 'WITH_OIDC_AUTHENTICATE__DEBUG',
   AUTHENTICATE_ERROR_CLEAR: 'AUTHENTICATE_ERROR_CLEAR',
   TERMS_ACCEPT: 'TERMS_ACCEPT',
   TERMS_ACCEPT__SUCCESS: 'TERMS_ACCEPT__SUCCESS',
diff --git a/client/src/locales/ar-YE/login.js b/client/src/locales/ar-YE/login.js
index e7464f4d..033916fb 100644
--- a/client/src/locales/ar-YE/login.js
+++ b/client/src/locales/ar-YE/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: 'إلغاء وإغلاق',
       continue: 'متابعة',
+      debugSso: 'تصحيح أخطاء تسجيل الدخول الموحد',
       goBack: 'العودة',
       goHome: 'الذهاب للرئيسية',
       logIn: 'تسجيل الدخول',
diff --git a/client/src/locales/bg-BG/login.js b/client/src/locales/bg-BG/login.js
index 5a95581d..4e4ee012 100644
--- a/client/src/locales/bg-BG/login.js
+++ b/client/src/locales/bg-BG/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Отказ и затваряне',
       continue: 'Продължи',
+      debugSso: 'Дебъгване на SSO',
       goBack: 'Назад',
       goHome: 'Към началото',
       logIn: 'Вход',
diff --git a/client/src/locales/ca-ES/login.js b/client/src/locales/ca-ES/login.js
index 0c58e6f7..aebf22d0 100644
--- a/client/src/locales/ca-ES/login.js
+++ b/client/src/locales/ca-ES/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Cancel·lar i tancar',
       continue: 'Continuar',
+      debugSso: 'Depurar SSO',
       goBack: 'Tornar',
       goHome: "Anar a l'inici",
       logIn: 'Iniciar sessió',
diff --git a/client/src/locales/cs-CZ/login.js b/client/src/locales/cs-CZ/login.js
index b737bc33..11acd2c5 100644
--- a/client/src/locales/cs-CZ/login.js
+++ b/client/src/locales/cs-CZ/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Zrušit a zavřít',
       continue: 'Pokračovat',
+      debugSso: 'Ladit SSO',
       goBack: 'Zpět',
       goHome: 'Domů',
       logIn: 'Přihlásit se',
diff --git a/client/src/locales/da-DK/login.js b/client/src/locales/da-DK/login.js
index 87aa00f5..544320fb 100644
--- a/client/src/locales/da-DK/login.js
+++ b/client/src/locales/da-DK/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Annuller og luk',
       continue: 'Fortsæt',
+      debugSso: 'Fejlfind SSO',
       goBack: 'Gå tilbage',
       goHome: 'Gå hjem',
       logIn: 'Log på',
diff --git a/client/src/locales/de-DE/login.js b/client/src/locales/de-DE/login.js
index 5d7d73b0..a9bd5fb5 100644
--- a/client/src/locales/de-DE/login.js
+++ b/client/src/locales/de-DE/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Abbrechen und schließen',
       continue: 'Fortfahren',
+      debugSso: 'SSO debuggen',
       goBack: 'Zurück gehen',
       goHome: 'Zur Startseite',
       logIn: 'Einloggen',
diff --git a/client/src/locales/el-GR/login.js b/client/src/locales/el-GR/login.js
index e18ccad9..0b6a618b 100644
--- a/client/src/locales/el-GR/login.js
+++ b/client/src/locales/el-GR/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Ακύρωση και κλείσιμο',
       continue: 'Συνέχεια',
+      debugSso: 'Αποσφαλμάτωση SSO',
       goBack: 'Επιστροφή',
       goHome: 'Αρχική σελίδα',
       logIn: 'Σύνδεση',
diff --git a/client/src/locales/en-GB/login.js b/client/src/locales/en-GB/login.js
index 81206524..d1511998 100644
--- a/client/src/locales/en-GB/login.js
+++ b/client/src/locales/en-GB/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: 'Cancel and close',
       continue: 'Continue',
+      debugSso: 'Debug SSO',
       goBack: 'Go back',
       goHome: 'Go home',
       logIn: 'Log in',
diff --git a/client/src/locales/en-US/login.js b/client/src/locales/en-US/login.js
index 81206524..d1511998 100644
--- a/client/src/locales/en-US/login.js
+++ b/client/src/locales/en-US/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: 'Cancel and close',
       continue: 'Continue',
+      debugSso: 'Debug SSO',
       goBack: 'Go back',
       goHome: 'Go home',
       logIn: 'Log in',
diff --git a/client/src/locales/es-ES/login.js b/client/src/locales/es-ES/login.js
index d07d65b1..ca4d7d0d 100644
--- a/client/src/locales/es-ES/login.js
+++ b/client/src/locales/es-ES/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Cancelar y cerrar',
       continue: 'Continuar',
+      debugSso: 'Depurar SSO',
       goBack: 'Volver',
       goHome: 'Ir al inicio',
       logIn: 'Iniciar sesión',
diff --git a/client/src/locales/et-EE/login.js b/client/src/locales/et-EE/login.js
index 7128832e..52be9e6f 100644
--- a/client/src/locales/et-EE/login.js
+++ b/client/src/locales/et-EE/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Tühista ja sulge',
       continue: 'Jätka',
+      debugSso: 'Siluda SSO',
       goBack: 'Tagasi',
       goHome: 'Koju',
       logIn: 'Logi sisse',
diff --git a/client/src/locales/fa-IR/login.js b/client/src/locales/fa-IR/login.js
index ce39d0eb..9edd7e13 100644
--- a/client/src/locales/fa-IR/login.js
+++ b/client/src/locales/fa-IR/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: 'لغو و بستن',
       continue: 'ادامه',
+      debugSso: 'اشکال‌زدایی SSO',
       goBack: 'بازگشت',
       goHome: 'رفتن به خانه',
       logIn: 'ورود',
diff --git a/client/src/locales/fi-FI/login.js b/client/src/locales/fi-FI/login.js
index 5c69248c..36f2ff95 100644
--- a/client/src/locales/fi-FI/login.js
+++ b/client/src/locales/fi-FI/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Peruuta ja sulje',
       continue: 'Jatka',
+      debugSso: 'Korjaa SSO-virheitä',
       goBack: 'Takaisin',
       goHome: 'Kotiin',
       logIn: 'Kirjaudu sisään',
diff --git a/client/src/locales/fr-FR/login.js b/client/src/locales/fr-FR/login.js
index a4410062..f9931820 100644
--- a/client/src/locales/fr-FR/login.js
+++ b/client/src/locales/fr-FR/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Annuler et fermer',
       continue: 'Continuer',
+      debugSso: 'Déboguer le SSO',
       goBack: 'Retour',
       goHome: "Aller à l'accueil",
       logIn: 'Se connecter',
diff --git a/client/src/locales/hu-HU/login.js b/client/src/locales/hu-HU/login.js
index da81a03d..9047833f 100644
--- a/client/src/locales/hu-HU/login.js
+++ b/client/src/locales/hu-HU/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Mégse és bezárás',
       continue: 'Folytatás',
+      debugSso: 'SSO hibakeresése',
       goBack: 'Vissza',
       goHome: 'Kezdőlapra',
       logIn: 'Belépés',
diff --git a/client/src/locales/id-ID/login.js b/client/src/locales/id-ID/login.js
index 032a75f5..12b5f663 100644
--- a/client/src/locales/id-ID/login.js
+++ b/client/src/locales/id-ID/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Batal dan tutup',
       continue: 'Lanjutkan',
+      debugSso: 'Debug SSO',
       goBack: 'Kembali',
       goHome: 'Ke beranda',
       logIn: 'Masuk',
diff --git a/client/src/locales/it-IT/login.js b/client/src/locales/it-IT/login.js
index 608a7b14..c263d41e 100644
--- a/client/src/locales/it-IT/login.js
+++ b/client/src/locales/it-IT/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Annulla e chiudi',
       continue: 'Continua',
+      debugSso: 'Debug SSO',
       goBack: 'Torna indietro',
       goHome: 'Vai alla home',
       logIn: 'Accedi',
diff --git a/client/src/locales/ja-JP/login.js b/client/src/locales/ja-JP/login.js
index efc4824a..2d0933b4 100644
--- a/client/src/locales/ja-JP/login.js
+++ b/client/src/locales/ja-JP/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'キャンセルして閉じる',
       continue: '続行',
+      debugSso: 'SSOをデバッグ',
       goBack: '戻る',
       goHome: 'ホームへ',
       logIn: 'ログイン',
diff --git a/client/src/locales/ko-KR/login.js b/client/src/locales/ko-KR/login.js
index 1e63164c..972b77fa 100644
--- a/client/src/locales/ko-KR/login.js
+++ b/client/src/locales/ko-KR/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: '취소 후 닫기',
       continue: '계속',
+      debugSso: 'SSO 디버그',
       goBack: '뒤로 가기',
       goHome: '홈으로 가기',
       logIn: '로그인',
diff --git a/client/src/locales/nl-NL/login.js b/client/src/locales/nl-NL/login.js
index e36c19b2..d92efb8d 100644
--- a/client/src/locales/nl-NL/login.js
+++ b/client/src/locales/nl-NL/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Annuleren en sluiten',
       continue: 'Doorgaan',
+      debugSso: 'SSO debuggen',
       goBack: 'Terug gaan',
       goHome: 'Naar startpagina',
       logIn: 'Inloggen',
diff --git a/client/src/locales/pl-PL/login.js b/client/src/locales/pl-PL/login.js
index 4b4d4bc1..b75809b1 100644
--- a/client/src/locales/pl-PL/login.js
+++ b/client/src/locales/pl-PL/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Anuluj i zamknij',
       continue: 'Kontynuuj',
+      debugSso: 'Debuguj SSO',
       goBack: 'Wróć',
       goHome: 'Idź do domu',
       logIn: 'Zaloguj',
diff --git a/client/src/locales/pt-BR/login.js b/client/src/locales/pt-BR/login.js
index effbc3b0..e5611560 100644
--- a/client/src/locales/pt-BR/login.js
+++ b/client/src/locales/pt-BR/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Cancelar e fechar',
       continue: 'Continuar',
+      debugSso: 'Depurar SSO',
       goBack: 'Voltar',
       goHome: 'Ir para início',
       logIn: 'Entrar',
diff --git a/client/src/locales/pt-PT/login.js b/client/src/locales/pt-PT/login.js
index 98c64ae1..7b5b47d6 100644
--- a/client/src/locales/pt-PT/login.js
+++ b/client/src/locales/pt-PT/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Cancelar e fechar',
       continue: 'Continuar',
+      debugSso: 'Depurar SSO',
       goBack: 'Voltar',
       goHome: 'Ir para início',
       logIn: 'Iniciar sessão',
diff --git a/client/src/locales/ro-RO/login.js b/client/src/locales/ro-RO/login.js
index c18721fc..de4d9a94 100644
--- a/client/src/locales/ro-RO/login.js
+++ b/client/src/locales/ro-RO/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Anulează și închide',
       continue: 'Continuă',
+      debugSso: 'Depanează SSO',
       goBack: 'Înapoi',
       goHome: 'Acasă',
       logIn: 'Autentificarea',
diff --git a/client/src/locales/ru-RU/login.js b/client/src/locales/ru-RU/login.js
index 0d1cb159..bfe1c6cb 100644
--- a/client/src/locales/ru-RU/login.js
+++ b/client/src/locales/ru-RU/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Отменить и закрыть',
       continue: 'Продолжить',
+      debugSso: 'Отладить SSO',
       goBack: 'Назад',
       goHome: 'На главную',
       logIn: 'Войти',
diff --git a/client/src/locales/sk-SK/login.js b/client/src/locales/sk-SK/login.js
index 7a91103d..788ba4c7 100644
--- a/client/src/locales/sk-SK/login.js
+++ b/client/src/locales/sk-SK/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Zrušiť a zavrieť',
       continue: 'Pokračovať',
+      debugSso: 'Ladiť SSO',
       goBack: 'Ísť späť',
       goHome: 'Ísť domov',
       logIn: 'Prihlásiť sa',
diff --git a/client/src/locales/sr-Cyrl-RS/login.js b/client/src/locales/sr-Cyrl-RS/login.js
index eb53fe01..ecffa99c 100644
--- a/client/src/locales/sr-Cyrl-RS/login.js
+++ b/client/src/locales/sr-Cyrl-RS/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Откажи и затвори',
       continue: 'Настави',
+      debugSso: 'Дебагуј SSO',
       goBack: 'Назад',
       goHome: 'Иди кући',
       logIn: 'Пријава',
diff --git a/client/src/locales/sr-Latn-RS/login.js b/client/src/locales/sr-Latn-RS/login.js
index 75e2ee86..aca277b7 100644
--- a/client/src/locales/sr-Latn-RS/login.js
+++ b/client/src/locales/sr-Latn-RS/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Otkaži i zatvori',
       continue: 'Nastavi',
+      debugSso: 'Debaguj SSO',
       goBack: 'Nazad',
       goHome: 'Idi kući',
       logIn: 'Prijava',
diff --git a/client/src/locales/sv-SE/login.js b/client/src/locales/sv-SE/login.js
index 58743087..dace8adc 100644
--- a/client/src/locales/sv-SE/login.js
+++ b/client/src/locales/sv-SE/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Avbryt och stäng',
       continue: 'Fortsätt',
+      debugSso: 'Felsök SSO',
       goBack: 'Gå tillbaka',
       goHome: 'Gå hem',
       logIn: 'Logga in',
diff --git a/client/src/locales/tr-TR/login.js b/client/src/locales/tr-TR/login.js
index 2c78dd41..96c5f3e4 100644
--- a/client/src/locales/tr-TR/login.js
+++ b/client/src/locales/tr-TR/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: 'İptal et ve kapat',
       continue: 'Devam et',
+      debugSso: 'SSO hatalarını ayıkla',
       goBack: 'Geri dön',
       goHome: 'Ana sayfaya git',
       logIn: 'Giriş yap',
diff --git a/client/src/locales/uk-UA/login.js b/client/src/locales/uk-UA/login.js
index 41ee019e..25e09af1 100644
--- a/client/src/locales/uk-UA/login.js
+++ b/client/src/locales/uk-UA/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Скасувати та закрити',
       continue: 'Продовжити',
+      debugSso: 'Відлагодити SSO',
       goBack: 'Назад',
       goHome: 'На головну',
       logIn: 'Увійти',
diff --git a/client/src/locales/uz-UZ/login.js b/client/src/locales/uz-UZ/login.js
index 29768cb3..9502c5b1 100644
--- a/client/src/locales/uz-UZ/login.js
+++ b/client/src/locales/uz-UZ/login.js
@@ -26,6 +26,7 @@ export default {
     action: {
       cancelAndClose: 'Bekor qilish va yopish',
       continue: 'Davom etish',
+      debugSso: 'SSO ni tuzatish',
       goBack: 'Orqaga',
       goHome: 'Bosh sahifaga',
       logIn: 'Kirish',
diff --git a/client/src/locales/vi-VN/login.js b/client/src/locales/vi-VN/login.js
index e4de4afc..af2b90c8 100644
--- a/client/src/locales/vi-VN/login.js
+++ b/client/src/locales/vi-VN/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: 'Hủy và đóng',
       continue: 'Tiếp tục',
+      debugSso: 'Gỡ lỗi SSO',
       goBack: 'Quay lại',
       goHome: 'Về trang chủ',
       logIn: 'Đăng nhập',
diff --git a/client/src/locales/zh-CN/login.js b/client/src/locales/zh-CN/login.js
index 8c51d33f..6920ad4e 100644
--- a/client/src/locales/zh-CN/login.js
+++ b/client/src/locales/zh-CN/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: '取消并关闭',
       continue: '继续',
+      debugSso: '调试SSO',
       goBack: '返回',
       goHome: '回到首页',
       logIn: '登录',
diff --git a/client/src/locales/zh-TW/login.js b/client/src/locales/zh-TW/login.js
index e8147489..b1ef51d6 100644
--- a/client/src/locales/zh-TW/login.js
+++ b/client/src/locales/zh-TW/login.js
@@ -25,6 +25,7 @@ export default {
     action: {
       cancelAndClose: '取消並關閉',
       continue: '繼續',
+      debugSso: '偵錯SSO',
       goBack: '返回',
       goHome: '回到首頁',
       logIn: '登入',
diff --git a/client/src/reducers/ui/authenticate-form.js b/client/src/reducers/ui/authenticate-form.js
index db475252..40f32020 100644
--- a/client/src/reducers/ui/authenticate-form.js
+++ b/client/src/reducers/ui/authenticate-form.js
@@ -16,6 +16,7 @@ const initialState = {
   isSubmitting: false,
   isSubmittingWithOidc: false,
   error: null,
+  debugLogs: null,
   pendingToken: null,
   step: null,
   termsForm: {
@@ -91,6 +92,12 @@ export default (state = initialState, { type, payload }) => {
         isSubmittingWithOidc: false,
         error: payload.error,
       };
+    case ActionTypes.WITH_OIDC_AUTHENTICATE__DEBUG:
+      return {
+        ...state,
+        isSubmittingWithOidc: false,
+        debugLogs: payload.logs,
+      };
     case ActionTypes.AUTHENTICATE_ERROR_CLEAR:
       return {
         ...state,
diff --git a/client/src/sagas/login/services/login.js b/client/src/sagas/login/services/login.js
index 40634419..19864681 100644
--- a/client/src/sagas/login/services/login.js
+++ b/client/src/sagas/login/services/login.js
@@ -106,6 +106,20 @@ export function* authenticateWithOidcCallback() {
     return;
   }
 
+  const oidcBootstrap = yield select(selectors.selectOidcBootstrap);
+
+  if (oidcBootstrap?.debug) {
+    const {
+      included: { logs },
+    } = yield call(api.debugOidc, {
+      code,
+      nonce,
+    });
+
+    yield put(actions.authenticateWithOidc.debug(logs));
+    return;
+  }
+
   let accessToken;
   try {
     ({ item: accessToken } = yield call(api.exchangeForAccessTokenWithOidc, {
diff --git a/docker-compose-dev.yml b/docker-compose-dev.yml
index 213b2e8c..bf361c86 100644
--- a/docker-compose-dev.yml
+++ b/docker-compose-dev.yml
@@ -77,6 +77,7 @@ services:
       # - OIDC_IGNORE_USERNAME=true
       # - OIDC_IGNORE_ROLES=true
       # - OIDC_ENFORCED=true
+      # - OIDC_DEBUG=true
 
       # Email Notifications (https://nodemailer.com/smtp/)
       # These values override and disable configuration in the UI if set.
diff --git a/docker-compose.yml b/docker-compose.yml
index 0ebe7b8c..d50340aa 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -95,6 +95,7 @@ services:
       # - OIDC_IGNORE_USERNAME=true
       # - OIDC_IGNORE_ROLES=true
       # - OIDC_ENFORCED=true
+      # - OIDC_DEBUG=true
 
       # Email Notifications (https://nodemailer.com/smtp/)
       # These values override and disable configuration in the UI if set.
diff --git a/server/.env.sample b/server/.env.sample
index 736b73ec..68c3ca45 100644
--- a/server/.env.sample
+++ b/server/.env.sample
@@ -68,6 +68,7 @@ SECRET_KEY=notsecretkey
 # OIDC_IGNORE_USERNAME=true
 # OIDC_IGNORE_ROLES=true
 # OIDC_ENFORCED=true
+# OIDC_DEBUG=true
 
 # Email Notifications (https://nodemailer.com/smtp/)
 # These values override and disable configuration in the UI if set.
diff --git a/server/api/controllers/access-tokens/debug-oidc.js b/server/api/controllers/access-tokens/debug-oidc.js
new file mode 100644
index 00000000..488eab16
--- /dev/null
+++ b/server/api/controllers/access-tokens/debug-oidc.js
@@ -0,0 +1,223 @@
+/*!
+ * Copyright (c) 2024 PLANKA Software GmbH
+ * Licensed under the Fair Use License: https://github.com/plankanban/planka/blob/master/LICENSE.md
+ */
+
+const Errors = {
+  NOT_ENOUGH_RIGHTS: {
+    notEnoughRights: 'Not enough rights',
+  },
+};
+
+module.exports = {
+  inputs: {
+    code: {
+      type: 'string',
+      maxLength: 2048,
+      required: true,
+    },
+    nonce: {
+      type: 'string',
+      maxLength: 1024,
+      required: true,
+    },
+  },
+
+  exits: {
+    notEnoughRights: {
+      responseType: 'forbidden',
+    },
+  },
+
+  async fn(inputs) {
+    if (!sails.config.custom.oidcDebug) {
+      throw Errors.NOT_ENOUGH_RIGHTS;
+    }
+
+    const logs = ['🔐 Starting OIDC debug flow...', ''];
+    const client = await sails.hooks.oidc.getClient();
+
+    if (!client) {
+      logs.push('❌ OIDC client is not initialized.');
+      logs.push('💡 Hint: Check your OIDC issuer and client configuration.');
+
+      return {
+        item: null,
+        included: {
+          logs,
+        },
+      };
+    }
+
+    let tokenSet;
+    try {
+      logs.push('🔄 Exchanging authorization code...');
+
+      if (sails.config.custom.oidcUseOauthCallback) {
+        tokenSet = await client.oauthCallback(
+          sails.config.custom.oidcRedirectUri,
+          {
+            iss: sails.config.custom.oidcIssuer,
+            code: inputs.code,
+          },
+          { nonce: inputs.nonce },
+        );
+      } else {
+        tokenSet = await client.callback(
+          sails.config.custom.oidcRedirectUri,
+          {
+            iss: sails.config.custom.oidcIssuer,
+            code: inputs.code,
+          },
+          { nonce: inputs.nonce },
+        );
+      }
+
+      logs.push('✅ Authorization code exchanged successfully.', '');
+    } catch (error) {
+      logs.push('❌ Failed to exchange authorization code.');
+      logs.push(`💬 Reason: ${error.message || error.toString()}`);
+      logs.push('💡 Hint: Check redirect URI, client secret, and nonce handling.');
+
+      return {
+        item: null,
+        included: {
+          logs,
+        },
+      };
+    }
+
+    if (sails.config.custom.oidcClaimsSource === 'id_token') {
+      logs.push('📥 Extracting claims from ID token...');
+
+      try {
+        claims = tokenSet.claims();
+        logs.push('✅ Claims extracted successfully.', '');
+      } catch (error) {
+        logs.push('❌ Failed to extract user claims.');
+        logs.push(`💬 Reason: ${error.message || error.toString()}`);
+
+        return {
+          item: null,
+          included: {
+            logs,
+          },
+        };
+      }
+    } else {
+      logs.push('📥 Fetching claims from userinfo endpoint...');
+
+      try {
+        claims = await client.userinfo(tokenSet);
+        logs.push('✅ Claims fetched successfully.', '');
+      } catch (error) {
+        logs.push('❌ Failed to fetch user claims.');
+
+        if (error instanceof SyntaxError && error.message.includes('Unexpected token e in JSON')) {
+          logs.push('💬 Reason: Userinfo response is signed or not JSON.');
+          logs.push(
+            '💡 Hint: Try configuring userinfo signed response algorithm or switch to ID token claims.',
+          );
+        } else {
+          logs.push(`💬 Reason: ${error.message || error.toString()}`);
+        }
+
+        return {
+          item: null,
+          included: {
+            logs,
+          },
+        };
+      }
+    }
+
+    logs.push('📦 Raw claims received:', JSON.stringify(claims, null, 2), '');
+    logs.push('🧩 Evaluating claim mappings...', '');
+
+    const mappings = {
+      email: {
+        attribute: sails.config.custom.oidcEmailAttribute,
+        value: _.get(claims, sails.config.custom.oidcEmailAttribute),
+      },
+      name: {
+        attribute: sails.config.custom.oidcNameAttribute,
+        value: _.get(claims, sails.config.custom.oidcNameAttribute),
+      },
+      username: sails.config.custom.oidcIgnoreUsername
+        ? undefined
+        : {
+            attribute: sails.config.custom.oidcUsernameAttribute,
+            value: _.get(claims, sails.config.custom.oidcUsernameAttribute),
+          },
+      roles: sails.config.custom.oidcIgnoreRoles
+        ? undefined
+        : {
+            attribute: sails.config.custom.oidcRolesAttribute,
+            value: _.get(claims, sails.config.custom.oidcRolesAttribute),
+          },
+    };
+
+    logs.push('📋 Mapping result:', JSON.stringify(mappings, null, 2), '');
+
+    if (!mappings.email.value) {
+      logs.push('❌ Email not resolved.');
+      logs.push('💡 Hint: Check email attribute mapping.', '');
+    }
+
+    if (!mappings.name.value) {
+      logs.push('❌ Name not resolved.');
+      logs.push('💡 Hint: Check name attribute mapping.', '');
+    }
+
+    if (!sails.config.custom.oidcIgnoreUsername) {
+      if (!mappings.username.value) {
+        logs.push('⚠️ Username not resolved.');
+        logs.push('💡 Hint: Check username attribute mapping.', '');
+      }
+    }
+
+    if (!sails.config.custom.oidcIgnoreRoles) {
+      if (!Array.isArray(mappings.roles.value) || mappings.roles.value.length === 0) {
+        logs.push('⚠️ Roles not resolved or empty.');
+        logs.push('💡 Hint: Check roles attribute mapping or IdP role configuration.', '');
+      } else {
+        logs.push('🎭 Resolving user role from OIDC roles...');
+
+        // Use a Set here to avoid quadratic time complexity
+        const claimsRolesSet = new Set(mappings.roles.value);
+
+        const foundRole = [User.Roles.ADMIN, User.Roles.PROJECT_OWNER, User.Roles.BOARD_USER].find(
+          (roleItem) => {
+            const configRoles = sails.config.custom[`oidc${_.upperFirst(roleItem)}Roles`];
+
+            if (configRoles.includes('*')) {
+              return true;
+            }
+
+            return configRoles.some((configRole) => claimsRolesSet.has(configRole));
+          },
+        );
+
+        if (foundRole) {
+          logs.push(`✅ Matched user role → ${_.lowerCase(foundRole)}`, '');
+        } else {
+          logs.push('⚠️ No user role matched configured OIDC roles.');
+          logs.push('💡 Hint: Check role matching settings.', '');
+        }
+      }
+    }
+
+    if (mappings.email.value && mappings.name.value) {
+      logs.push('🎉 OIDC debug completed successfully.');
+    } else {
+      logs.push('🛑 OIDC debug detected missing required attributes.');
+    }
+
+    return {
+      item: null,
+      included: {
+        logs,
+      },
+    };
+  },
+};
diff --git a/server/api/controllers/config/test-smtp.js b/server/api/controllers/config/test-smtp.js
index 8e626d5a..05757610 100644
--- a/server/api/controllers/config/test-smtp.js
+++ b/server/api/controllers/config/test-smtp.js
@@ -61,9 +61,8 @@ module.exports = {
       return Errors.NOT_AVAILABLE;
     }
 
-    const logs = [];
+    const logs = ['📧 Sending test email...'];
     try {
-      logs.push('📧 Sending test email...');
       /* eslint-disable no-underscore-dangle */
       const info = await transporter.sendMail({
         to: currentUser.email,
@@ -72,16 +71,16 @@ module.exports = {
         html: this.req.i18n.__('This is a <i>test</i> <b>html</b> <code>message</code>!'),
       });
       /* eslint-enable no-underscore-dangle */
-      logs.push('✅ Email sent successfully!', '');
+      logs.push('✅ Email sent successfully.', '');
 
       logs.push(`📬 Message ID: ${info.messageId}`);
       if (info.response) {
         logs.push(`📤 Server response: ${info.response.trim()}`);
       }
 
-      logs.push('', '🎉 Your configuration is working correctly!');
+      logs.push('', '🎉 Your configuration is working correctly.');
     } catch (error) {
-      logs.push('❌ Failed to send email!', '');
+      logs.push('❌ Failed to send email.', '');
 
       if (error.code) {
         logs.push(`⚠️ Error code: ${error.code}`);
diff --git a/server/api/helpers/users/get-or-create-one-with-oidc.js b/server/api/helpers/users/get-or-create-one-with-oidc.js
index 69ea93e5..4d9298ce 100644
--- a/server/api/helpers/users/get-or-create-one-with-oidc.js
+++ b/server/api/helpers/users/get-or-create-one-with-oidc.js
@@ -106,6 +106,7 @@ module.exports = {
             if (configRoles.includes('*')) {
               return true;
             }
+
             return configRoles.some((configRole) => claimsRolesSet.has(configRole));
           },
         );
diff --git a/server/api/hooks/oidc/index.js b/server/api/hooks/oidc/index.js
index b0fde749..73a1dce2 100644
--- a/server/api/hooks/oidc/index.js
+++ b/server/api/hooks/oidc/index.js
@@ -89,11 +89,16 @@ module.exports = function defineOidcHook(sails) {
         authorizationUrlParams.response_mode = sails.config.custom.oidcResponseMode;
       }
 
-      return {
+      const bootstrap = {
         authorizationUrl: instance.authorizationUrl(authorizationUrlParams),
         endSessionUrl: instance.issuer.end_session_endpoint ? instance.endSessionUrl({}) : null,
         isEnforced: sails.config.custom.oidcEnforced,
       };
+      if (sails.config.custom.oidcDebug) {
+        bootstrap.debug = true;
+      }
+
+      return bootstrap;
     },
 
     isEnabled() {
diff --git a/server/config/custom.js b/server/config/custom.js
index 71424be7..6f8bfc59 100644
--- a/server/config/custom.js
+++ b/server/config/custom.js
@@ -94,6 +94,7 @@ module.exports.custom = {
   oidcIgnoreUsername: process.env.OIDC_IGNORE_USERNAME === 'true',
   oidcIgnoreRoles: process.env.OIDC_IGNORE_ROLES === 'true',
   oidcEnforced: process.env.OIDC_ENFORCED === 'true',
+  oidcDebug: process.env.OIDC_DEBUG === 'true',
 
   // TODO: move client base url to environment variable?
   oidcRedirectUri: `${
diff --git a/server/config/policies.js b/server/config/policies.js
index 8c6f38cb..8c2879b4 100644
--- a/server/config/policies.js
+++ b/server/config/policies.js
@@ -48,6 +48,7 @@ module.exports.policies = {
   'terms/show': true,
   'access-tokens/create': true,
   'access-tokens/exchange-with-oidc': true,
+  'access-tokens/debug-oidc': true,
   'access-tokens/accept-terms': true,
   'access-tokens/revoke-pending-token': true,
 };
diff --git a/server/config/routes.js b/server/config/routes.js
index 0e9b1fd7..e65ec4b3 100644
--- a/server/config/routes.js
+++ b/server/config/routes.js
@@ -81,6 +81,7 @@ module.exports.routes = {
 
   'POST /api/access-tokens': 'access-tokens/create',
   'POST /api/access-tokens/exchange-with-oidc': 'access-tokens/exchange-with-oidc',
+  'POST /api/access-tokens/debug-oidc': 'access-tokens/debug-oidc',
   'POST /api/access-tokens/accept-terms': 'access-tokens/accept-terms',
   'POST /api/access-tokens/revoke-pending-token': 'access-tokens/revoke-pending-token',
   'DELETE /api/access-tokens/me': 'access-tokens/delete',