public override async void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
{
var trimmedDeviceToken = deviceToken?.Description;
if (string.IsNullOrWhiteSpace(trimmedDeviceToken)) return;
trimmedDeviceToken = trimmedDeviceToken.Trim('<').Trim('>');
trimmedDeviceToken = trimmedDeviceToken.Replace(" ", string.Empty);
await RegisterForPushNotifications(trimmedDeviceToken);
}
/// <summary>