android – Google Sign-In Failed with “Access blocked: Authorization error, Error: Invalid_scope” in Flutter

I’m getting an “Access blocked: Authorization error, Error: Invalid_scope” error when trying to implement Google Sign-In in my Flutter application with multiple OAuth scopes.

Error Message

Access blocked: Authorization error, Error: Invalid_scope

My Setup

Flutter Version: [Your Flutter version]
google_sign_in package: [Your package version]
Platform: Android
Target: Google Calendar, and basic profile access

OAuth Request Details
My OAuth request includes the following parameters:

login_hint=ak**********@gmail.com  
hl=en-IN  
response_type=consent_proof  
android_options=CAMQAQ  
color_scheme=dark  
client_id=*200-m552****************n15f59*p7****kr*u.apps.googleusercontent.com  
include_granted_scopes=true  
scope=     openid     
flowName=GeneralOAuthFlow

Google Cloud Console Configuration
✅ Created OAuth 2.0 Client ID for Android
✅ Added correct package name and SHA-1 fingerprint
✅ Enabled Google Calendar API
✅ Enabled Google Keep API (if available)
✅ Added test users to OAuth consent screen

Code Implementation

import 'package:google_sign_in/google_sign_in.dart';

class GoogleSignInService {
  static final GoogleSignIn _googleSignIn = GoogleSignIn(
    scopes: [
      'email',
      'profile',
      'openid',
      '',
      '',
    ],
  );

  static Future signIn() async {
    try {
      final GoogleSignInAccount? account = await _googleSignIn.signIn();
      return account;
    } catch (error) {
      print('Google Sign-In Error: $error');
      return null;
    }
  }
}