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

I got "Internal error has occurred" when run the project. Please make sure your emulator connect with internet. In my case my emulator didn't connect with internet. for that following these steps.(For Windows PC)

1. Go to the WiFi settings.
2. Change adapter options.
3. Right click WiFi and go to the properties.
4. Then go to the sharing tab.
5. Checked these two components and press OK.

Then in emulator, switch off WiFi and switch on again. It's worked for me.