#55 most commonauthCursorWindsurfBolt.newReplitv0

Firebase: auth/unauthorized-domain

FirebaseError: Firebase: Error (auth/unauthorized-domain). This domain is not authorized for OAuth operations for your Firebase project.

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What it means

Firebase only allows sign-in from websites you've listed. Your live site's address isn't on that list yet.

How to fix it: paste this prompt into your AI builder

Fix prompt for Bolt, Cursor, Replit, v0, Windsurf
Firebase sign-in fails with auth/unauthorized-domain. Don't change code; tell me to add my production domain (and any preview domains) in Firebase console, Authentication, Settings, Authorized domains, and check that authDomain in the Firebase config is correct.

If the AI can't fix it: manual steps

  1. Firebase console, Authentication, Settings, Authorized domains, Add domain.

Where this happens

Seen in these AI app builders and editors:

CursorWindsurfBolt.newReplitv0

Sources

Related auth errors

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