Google Sign in with Custom code works on iOS but fails on Android

I have written a custom function to sign in with google so that user can add events to their google calendar. It's working well on iOS but on android once I choose a google account to sign in, nothing happens. What could be wrong?

Here's the code:
// Automatic FlutterFlow imports

import '/backend/backend.dart';

import '/flutter_flow/flutter_flow_theme.dart';

import '/flutter_flow/flutter_flow_util.dart';

import '/custom_code/actions/index.dart'; // Imports other custom actions

import '/flutter_flow/custom_functions.dart'; // Imports custom functions

import 'package:flutter/material.dart';

// Begin custom action code

// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

import 'package:flutter/foundation.dart';
import 'package:google_sign_in/google_sign_in.dart';

Future<String?> signInWithGoogleAndroid() async {

// Add your function code here!

try {

final GoogleSignIn googleSignIn = GoogleSignIn(

clientId:

"client",

scopes: <String>[

'https://www.googleapis.com/auth/calendar',

'https://www.googleapis.com/auth/calendar.events'

],

);

final GoogleSignInAccount? googleSignInAccount = await googleSignIn.signIn();

final GoogleSignInAuthentication googleSignInAuthenction =

await googleSignInAccount!.authentication;

return googleSignInAuthenction.accessToken;

} catch (error) {

print('Error Signing with google');

return null;

}

}