[Flutter] Flutter Google play services

I am creating a flutter game which utilise the Google play games. I use the game_services package.

When I tried to signIn, the logs says like this:

code:

void signin() async {
try {
print('account before: $account');
account = await GamesServices.signIn();
print('account: $account');
} catch (e) {
print('Error on signing: $e');
}
}

@override
void initState() {
signin();
super.initState();
}


Logs: I/PlayService( 2169): isAuthenticated: true toString: com.google.android.gms.games.AuthenticationResult@c64b8d0 I/signin ( 2169): success I/flutter ( 2169): account: null

You can see even after saying success, the account String is empty.

I had completed these steps

1. added game_services package
2. included app_id in AndroidManifest
3. created OAuth 2.0 Client ID and auth consent screen inside Google cloud project
4. added xml file inside android/app/src/main/res/values/games-ids.xml

I want to know why account is null.

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