Android Debug Build Fails to Add 'Sign in with Google' Button Due to OAuth Configuration Issues

Below are several areas you can check or try to resolve the issue:

1. Verify the Web Client ID

Even though you’ve set up OAuth client IDs for your Android builds, the code is using a web client ID (passed as webClientId to both builders). Make sure that:

• The variable webClientId contains the actual valid client ID for your Google Cloud project.
• This client ID is of the “Web Application” type. In some cases an empty or incorrect string will cause the underlying API to misbehave, including presenting errors like “activity is cancelled by the user.”

For example, update your code to use the actual client ID:

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val webClientId = "YOUR_WEB_CLIENT_ID.apps.googleusercontent.com"

2. Double-Check Package Name and SHA1 Fingerprint

Even if you checked these already, it’s good to verify:

• The package name used in the debug build (com.example.name.debug) exactly matches one of the OAuth client entries in your Google Cloud console.
• The SHA1 fingerprint (from ./gradlew signingReport) exactly matches the fingerprint registered for that package.
• Sometimes minor differences (such as an extra suffix or a mismatch in the debug variant) can cause the API to reject the request.

3. OAuth Consent Screen and Test Users

Ensure that you have:

• Properly configured the OAuth consent screen within Google Cloud Console.
• If your app is in testing mode, added your test account (the account you’re using on the device/emulator) to the list of test users.

Misconfigured consent screens can lead to messages suggesting the developer console isn’t set up correctly.

4. Include Both Credential Options

You currently have commented out the call to add SignInWithGoogleOption to the GetCredentialRequest. While using GoogleIdOption alone is valid, sometimes including SignInWithGoogleOption helps in processing the request flow. Consider trying:

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val request = GetCredentialRequest.Builder()
    .addCredentialOption(googleIdOption)
    .addCredentialOption(signInWithGoogleOption)
    .build()

This may change the behavior and help pinpoint if one or both flows are misconfigured.

5. Clean Project and Reinstall

Sometimes changes in credentials or manifest settings aren’t picked up immediately:

• Clean the project, rebuild it, and reinstall the app.
• Ensure that older versions that might be cached on your device or emulator are fully removed.

6. Check Google Play Services

Finally, ensure that the device or emulator has updated Google Play Services since the credentials flow depends on these libraries being current.

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By verifying these configuration details and updating your request to include both options, you should be able to pinpoint the misconfiguration in your developer console setup. If problems persist, checking detailed logcat output or even regenerating OAuth credentials (and allowing a few minutes for propagation) may help resolve the error.