Fix Google Sign-In Issue in React Native Expo App

Google Sign-In works fine on iOS but fails on Android (emulator + devices) in my Expo app.

Setup:

• React Native (Expo SDK)
• Firebase Authentication
• @react-native-google-signin/google-signin

Checked Already:

• SHA-1 matches Firebase
• Package name correct

Need: An experienced React Native + Firebase dev to fix Google Sign-In on Android so it works in both dev & prod builds.

If you’ve debugged OAuth flows in Expo before, this should be quick