Question

Firebase auth/unauthorized-domain after connecting my own domain

Solved · 612 viewsasked 5 months ago by

Moved my app from the .web.app address to my own domain. Google login popup now closes immediately and the console shows

FirebaseError: Firebase: Error (auth/unauthorized-domain).

Everything else works on the new domain.

What I’ve tried

Windsurf changed the authDomain in the firebase config to my new domain, which made it worse (popup shows a 404).

Comment

Authorized domains list in the Firebase console. Two minutes, answer below.

sven_fire 5 months ago

2 answers

Marked as helpful by the asker

sven_fire5 months ago

Firebase console → Authentication → Settings → Authorized domains → Add domain. Add both example.com and www.example.com if you use both.

And put authDomain back to yourproject.firebaseapp.com. Pointing authDomain at your own domain only works if that domain serves Firebase's /__/auth/ handler (which it does on Firebase Hosting with extra setup), that's why you got a 404.

Comment

Added the domain, reverted authDomain, works. Was 2 minutes, I spent 2 hours before asking.

ellie_vc 5 months ago

Happens to everyone once.

sven_fire 5 months ago

lukas_b4 months ago

Later on, if Safari users get stuck in a login loop with the redirect flow, that's when you do the custom authDomain setup properly. The Firebase docs have a page on redirect best practices for exactly that.

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Firebase auth/unauthorized-domain after connecting my own domain

What I’ve tried

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Firebase auth/unauthorized-domain after connecting my own domain

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