Fix Firebase Google Sign-In

I have a small React Native project that should let users sign in with Google through Firebase and then display a WebView. The current build compiles, but every time I press the Google login button I get “ERROR 10”.

I’m targeting both iOS and Android. The Android side already has the `google-services.json` file and the SHA-1 fingerprint is entered in Firebase, yet the error persists. I haven’t added the iOS `GoogleService-Info.plist` or any iOS-specific keys yet, so we may need to look at that too.

I’d like to jump on a Google Meet screen-share so you can walk me through whatever is missing—client ID, reversed OAuth URL, URL scheme, bundle ID, or any other Firebase/Google-sign-in detail I might have overlooked. My goal is simple: tap the “Sign in with Google” button and land in the WebView without errors on both platforms.

Deliverable
• During the call, identify and apply the correct configuration so the Google sign-in flow succeeds on at least one platform live, with clear next steps (or fixes) for the second platform if needed.


I need very expertise resource because i cant waste time. Thank you