Firesbase auth fallback exception : Java lang exception

Question

Firebase Auth causes error if I set code shrinker to R8. I am frustrated its been a week solving it, but i could not solve it. 'Unable to instantiate service com.google.firebase.auth.api.fallback.service.FirebaseAuthFallbackService: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.auth.api.fallback.service.FirebaseAuthFallbackService"'

My Android Properties:

Full Error

Answer 1

In your proguard.cfg file you need to add the line;

-keep class com.google.firebase.auth.api.fallback.service.FirebaseAuthFallbackService { *; }