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Atif Ali
48e9bb3391
## Problem On a fresh deployment with no custom GitHub OAuth app, Coder falls back to the default Coder-managed GitHub app. That app can only see organization memberships in organizations where it has been installed. If `CODER_OAUTH2_GITHUB_ALLOWED_ORGS` is set but the app isn't installed in the allowed organizations, the membership list comes back empty and every login, including the first admin login, is rejected with a bare "You aren't a member of the authorized Github organizations!" with no hint about the actual cause. This leaves fresh deployments in an apparently broken state. ## Fix * Append a remediation hint to the login rejection when the default provider is configured, pointing at the [app installation page](<https://github.com/apps/coder/installations/select_target>) and at configuring a custom GitHub OAuth app. * Log a startup warning when the default provider is combined with `CODER_OAUTH2_GITHUB_ALLOWED_ORGS`, listing the allowed orgs and the install URL. * Document the installation requirement next to the `CODER_OAUTH2_GITHUB_ALLOWED_ORGS` step in the GitHub auth docs. Access-control behavior is unchanged; the org check still rejects logins as before, it just explains why and how to fix it. ## Testing * New `TestUserOAuth2Github/NotInAllowedOrganizationDefaultProvider` asserts the hint appears when `DefaultProviderConfigured` is set; the existing `NotInAllowedOrganization` subtest asserts it does not leak into the custom-app path. Fixes coder/coder#17752