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You have missed configuration step enable google login on firebase.

Google sign-in is automatically configured on your connected iOS and web apps. To set up Google sign-in for your Android apps, you need to add the SHA1 fingerprint for each app on your Project Settings.

✅ Just complete these enough steps below

1. Enable Google Auth Method
2. Configure certificate fingerprints in your current project at project-level setting. How to Generate certificate.
3. Select email for Project support email
4. Download google-service.json into my project.
5. Run flutter clean
6. start flutter run

image

You have missed configuration step enable google login on firebase.

Google sign-in is automatically configured on your connected iOS and web apps. To set up Google sign-in for your Android apps, you need to add the SHA1 fingerprint for each app on your Project Settings.

✅ Just complete these enough steps below

1. Enable Google Auth Method
2. Configure certificate fingerprints in your current project at project-level setting. How to Generate certificate.
3. Select email for Project support email
4. Download google-service.json into your project.
5. Run flutter clean
6. start flutter run

image