Can't login to my firebase backend base app on iOS but works on android

Ionic Framework
4

Here is the solution to the issue,
I added this code in app.component and it is working in the iOS simulator. Here is the full file with imports:

import { Component } from '@angular/core';
import { Capacitor } from '@capacitor/core';
import { initializeApp } from 'firebase/app';
import { indexedDBLocalPersistence, initializeAuth } from 'firebase/auth';
import { environment } from 'src/environments/environment';

@Component({
  selector: 'app-root',
  templateUrl: 'app.component.html',
  styleUrls: ['app.component.scss'],
})
export class AppComponent {
  constructor() {
    const app = initializeApp(environment.firebase);
    if (Capacitor.isNativePlatform) {
      initializeAuth(app, {
        persistence: indexedDBLocalPersistence
      });
    }
  }
}

source: Firebase auth in SDK 9 does not work on ios sim or devices - #8 by uncoded

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