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 also appeared in same problem, when I changed platform for my Project. Even I added SHA-1 key to firebase console it was not working. After I checked in Google cloud platform (console.cloud.google.com) with my project name. I show that Auto generated API key does not contains my new SHA-1 key. so I updated it manually by adding project's package name and SHA key and it works.