Hi @secomm, welcome to the Auth0 community!
To help us better understand and diagnose the issue, could you please provide us with the following information:
- Which Vercel Deployment Environment are you testing the authentication: Production or Preview environments.
- Which are the versions of Next.js and Auth0 Next.js SDK dependencies in your project?
- Are you using Pages Router or App Router?
- Could you please send us a screenshot of the error you’re experiencing?
- Can you please double-check if you get an error log on Vercel for the
/api/auth/callback
route?
Thanks.