CallbackRouteError on SSO login (Azure/Entra) via Cognito Hosted UI — works for email/password

[jharman-amergis]

Hello community,

I’m using NextAuth with the Cognito provider.
• Regular Cognito login (email/password) works fine.
• SSO login via Cognito Hosted UI (federated with Azure/Entra) fails at the callback with a CallbackRouteError (no NextAuth callbacks are triggered).

What I’ve tried:
• Callback URIs and OAuth scopes (openid, email, profile) are correct.
• Cognito attribute mapping for email, name etc. looks fine.
• Multiple Azure users tested.

Has anyone gotten this exact setup working? Thank you, greatly appreciate any guidance.