Just migrated Firebase project, and now Google Auth doesn't work

[Benjamin Mueller]

Hi,

Apologies if this should be obvious, or is documented somewhere I cannot find.

Anyway, we just migrated one of our test projects over to the new console, and when I attempt to authenticate in the app via Google auth, I get an error on the following URL (client-specific data removed):

https://accounts.google.com/o/oauth2/auth?response_type=token+code+id_token+gsession&client_id=[myId]&scope=email+openid&redirect_uri=[myUri]&state=[myState]&include_profile=true

The error is:

401. That's an error

Error: invalid_client

The OAuth client was not found.

Request Details:scope=email openid

• response_type=token code id_token gsession
• redirect_uri=[myUri]
• state=[myState]
• client_id=[myId]
• include_profile=true

I've created a Firebase project directly in the new console, uploaded an instance of our app to Firebase hosting that points to this new project, and that works just fine. I have verified that Google Auth is enabled in the app that is not currently working. The breaking app worked properly when it was on the old console. I don't have direct control over this particular app, so I don't know if billing needs to be migrated (though it's on the "Spark" plan, so I don't think there's anything to migrate).

What silly thing am I missing?

Thanks!

[Alex Memering]

I'm really sorry that you're you're running into this issue. It might be that our migration process threw your app into a weird state. Please take a look and make sure that you have both a valid Google OAuth Web Client id and secret. You may also need to whitelist the Google OAuth Client ids that you’re using to authenticate Google users in your application. Specifically, within the Auth > Sign-In Method > Google section of the new console, there is a section to "Whitelist client IDs from external projects". If that does not work then please reach out to support.

Sorry for your troubles,

Alex

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[Benjamin Mueller]

Thanks for the update. This doesn't give me quite enough to go on. I don't know how to tell if my Google OAuth Web Client id and secret are valid. I also don't know under what circumstances I need to whitelist the client ids (e.g. I have another project with no whitelisted ids, and it works fine--though that project was created in the new console). I have a ticket open with Firebase Support, so I'll continue the discussion there. I'll update this thread with whatever info is helpful and can be shared.