Unity Android
Must be 64-bit Architectures
Open Android SDK Manager
Android SDK Tools
Android SDK Platform-tools
Android SDK build tools
Android Support Repository
Google Play Services
Google Repository
Google USB Driver
Setup package name in Project Settings - Player Settings
Scripting backend to IL2CPP
ARMv7 - 32 Bit (Old devices)
ARM64 - 64 Bit
To Test locally:
Copy the SHA-1 from the Upload Certificate, to the GCP Project
References
https://www.youtube.com/watch?v=0LGs1Xtt_1I
https://github.com/playgameservices/play-games-plugin-for-unity/blob/master/README.md
https://github.com/playgameservices/play-games-plugin-for-unity/issues/2045#issuecomment-350335234