Firebase Android: An internal error has occurred. [ OPERATION_NOT_ALLOWED ]

Question

Signing in via Google in my application gives this error:

An internal error has occurred. [ OPERATION_NOT_ALLOWED ]

I have enabl

Answer 1

finally I found the solution which worked for me. The fact is that even when you have setup successfully the email+password auth method you need to create a mobile app(in my case) and associate it with your project. After that FireBase will work as expected.