Lovable login not working: auth and redirect troubleshooting
A login problem can originate in generated client code, the auth provider, redirect configuration, cookies/session handling, or the difference between preview and production URLs.
WHAT THIS USUALLY LOOKS LIKE
- Login redirects back to the sign-in page.
- OAuth succeeds but the app still appears logged out.
- Login works in preview but not on the custom domain.
- Users see a blank page after authentication.
LIKELY FAILURE AREAS
Redirect URL mismatch
The provider and application must agree on valid callback and site URLs.
Session handling
The application may navigate before the auth session is established or fail to restore it after redirect.
Environment mismatch
Production can use different Supabase/OAuth configuration from preview.
CHECK THESE FIRST
- Capture the complete redirect chain and browser console errors.
- Check the auth provider's allowed callback/redirect URLs.
- Inspect whether a session exists after the callback.
- Compare production auth environment values with the intended project.
- Test with a clean browser session.
WHAT WE NEED TO INVESTIGATE IT
- GitHub repository
- Deployed URL
- Test account or reproducible auth path
- Auth-provider/Supabase access only if configuration must change
Do not paste passwords, private API keys or other secrets into the public submission form. We request additional access only after scope review when it is actually required.
COMMON QUESTIONS
Why does login work in preview but not production?+
Preview and production commonly have different origins, callback URLs and environment configuration. Compare those before changing application logic.
Should I send VibeHell my password?+
No. Use a dedicated test account when one is necessary, and never paste secrets into the public intake form.
RELATED FIX GUIDES
STOP DEBUGGING
THE PROMPT LOOP.
VibeHell investigates the actual application, confirms scope and price, then implements and verifies the repair.