Ionic Firebase FCM sometime not working for IOS

Before posting the question let me clear that I have tried found the solution everywhere from google but no success

My Ionic project built using ionic 5

Install package through npm i cordova-plugin-fcm-with-dependecy-updated

app.module.ts

import { FCM } from 'cordova-plugin-fcm-with-dependecy-updated/ionic/ngx';

@NgModule({
  declarations: [...],
  entryComponents: [...],
  imports: [...],
  providers: [
    FCM
  ],
  bootstrap: [AppComponent],
})
export class AppModule {}

app.component.ts

import { FCM } from 'cordova-plugin-fcm-with-dependecy-updated/ionic/ngx';

constructor(
    private platform: Platform,
    private fcm: FCM
  ) {}

initializeApp() {
 this.platform.ready().then(() => {

if (this.platform.is('ios')) {
    this.fcm.requestPushPermission().then((context) => {
      this.fcm.getToken().then((token) => {
        localStorage.setItem(Constants.DEVICETOKEN, token);
        console.log(token, 'token.');
        console.log(this.deviceTypeId, 'devicetype');
      });
    })
  } else {
    this.fcm.getToken().then((token) => {
      localStorage.setItem(Constants.DEVICETOKEN, token);
      console.log(token, 'token.');
      console.log(this.deviceTypeId, 'devicetype');
    });
  }

  this.fcm.onNotification().subscribe((data) => {
    console.log(data);
    if (data.wasTapped) {
      console.log('Received in background');
    } else {
      this.utility.showSuccessToast(data.body);
      console.log('Received in foreground');
    }
  });
  this.fcm.clearAllNotifications();
}

Token saved in SQL database

APIs calls

public static NotificationResponseModel SendNotification(NotificationModel notificationModel)
{
            NotificationResponseModel response = new NotificationResponseModel();
  try {
                FcmSettings settings = new FcmSettings()
    {
      SenderId = Constant.SenderId,
        ServerKey = Constant.ServerKey,
                };
                HttpClient httpClient = new HttpClient();

                string authorizationKey = string.Format("keyy={0}", settings.ServerKey);
                string deviceToken = notificationModel.DeviceId;

    httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", authorizationKey);
    httpClient.DefaultRequestHeaders.Accept
      .Add(new MediaTypeWithQualityHeaderValue("application/json"));

    GoogleNotification.DataPayload dataPayload = new GoogleNotification.DataPayload();
    dataPayload.Title = notificationModel.Title;
    dataPayload.Body = notificationModel.Body;


                GoogleNotification notification = new GoogleNotification();
    notification.Data = dataPayload;
    notification.Notification = dataPayload;
    //notification.Data.Id = notificationModel.Id;
    //notification.Data.Type = notificationModel.Type;

    var fcm = new FcmSender(settings, httpClient);
    var fcmSendResponse = fcm.SendAsync(deviceToken, notification);

    if (fcmSendResponse.Result.IsSuccess()) {
      response.IsSuccess = true;
      response.Message = "Notification sent successfully";
      return response;
    }
    else {
      response.IsSuccess = false;
      response.Message = fcmSendResponse.Result.Failure.ToString();
      return response;
    }
  }
  catch (Exception ex)
  {
    response.IsSuccess = false;
    response.Message = "Something went wrong";
    return response;
  }
}

My code is worked perfect on android but not 100% working on IOS. I spent lots of time to figure it out but no success

Anyone please look my code and suggest me the mistake

Thanks in advance!