Fix Spring Boot SSO authentication -- 2

My Java / Spring Boot application uses Auth0 for Single Sign-On, yet the login flow never finishes: users are redirected to Auth0, but they never land back in the app with a valid session. I have already Reviewed Spring Boot configurations, so the problem lies deeper—perhaps in callback handling, token validation, or an overlooked Auth0 setting. I need a developer who can: • trace the entire OAuth2 / OIDC handshake between Spring Security and Auth0 • pinpoint why the flow stalls and implement a solid fix • update any mis-aligned Spring or Auth0 configuration properties • document the changes so I can reproduce them in staging and production Please be comfortable reading verbose DEBUG logs, stepping through Spring Security filters, and testing with Postman or curl. Once the fix is in place, I’ll verify that a fresh login cleanly authenticates and that protected endpoints recognise the user context without manual intervention.

Project ID: 40263830