A persistent issue with Google Sign-In failing in production on Android, despite working in debug modes, has been identified as a hidden SHA-1 fingerprint problem related to Play App Signing. The solution involves downloading the deployment certificate from Google Play Console and using its SHA-1 fingerprint in the Google Cloud Console's Android OAuth client, rather than relying on the visible fingerprints. This corrects the mismatch between the app's signing certificate and Google's expectations, resolving the issue without requiring an app rebuild.
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