Firebase Auth: Requests from this Android client application com.xxx are blocked

Question

I\'m implementing the standard tutorial for Firebase AuthUI in my android app. However, when testing I try to sign-in using Google sign-in from within the app and get the follow

Answer 1

I've had this problem and looked left and right for a solution. Turns out, in my case at least, that you actually need to go the Credentials screen in the Google Cloud Platform and there you'll find this:

Restrict usage to your Android apps Add your package name and SHA-1 signing-certificate fingerprint to restrict usage to your Android apps

There you can ADD NEW ITEM, meaning your application package and its SHA-1 signature. Then you won't have this problem anymore (assuming the rest of the configuration is done). My app had its key restricted for Android apps and this step was a necessary one.