Push Notifications no longer working since iOS 13 for Xamarin app

Question

Since the public release of iOS 13 push notifications appear to no longer work for my Xamarin.Forms iOS project. I currently use Azure Notification Hub to send test notifications and previously, my iPhones would get notifications with no problem. Since iOS13 this is no longer happening.

I don't use OneSignal but they did post an article about the changes that were made for Push Notifications: https://onesignal.com/blog/ios-13-introduces-4-breaking-changes-to-notifications/

Is this problem still present? Or has anyone got any sources to confirm this issue other than SignalOne?

public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken) {
    if (Hub == null) {
        Hub = new SBNotificationHub(ApiConstants.ListenConnectionString, ApiConstants.NotificationHubName);
    }

    // Following from the comments with FreakyAli, I have added these 3 lines
    Byte[] result = new byte[deviceToken.Length];
    Marshal.Copy(deviceToken.Bytes, result, 0, (Int32)deviceToken.Length);
    String token = BitConverter.ToString(result).Replace("-", "");

    // Update registration with Azure Notification Hub
    Hub.UnregisterAllAsync(token, (error) => {
        if (error != null) {
            Debug.WriteLine($"Unable to call unregister {error}");
        }

        NSSet tags = null;

        Hub.RegisterNativeAsync(deviceToken, tags, (errorCallback) => {
            if (errorCallback != null) {
                Debug.WriteLine($"RegisterNativeAsync error: {errorCallback}");
            }
        });
    });
}

The code above worked all the time but during debugging I have noticed it no longer steps into Hub.UnregisterAllAsync() and I believe it is causing some error? (Can't make any sense of it though)

=================================================================
    Basic Fault Address Reporting
=================================================================
Memory around native instruction pointer (0x1bffaaf44):
0x1bffaaf34  c0 03 
5f d6 1f 
20 03 d5 
1f 20 
03 d5 01 ec 
7c 92  
.._.. 
...
 ..
..|
.
0x1bffaaf44  20 00 c0 3d c3 f9 ff 10 
62 04 c1 3c 02 0c 40 92 
  ..=.
..
.b.
.<.
.@.

0x1bffaaf54  
63 00 02 
cb 61 00 
c0 3d 00 1c a1 4e 
05 00 
00 
14 
 c.
..
a.
.=.
.
.
N....
0x1bffaaf64  1f 20 03 d5 
1f 20 03 d5 1f 20 03 d5 20 0c 
c1 3c  . ..
. ... .. ..<

I have found these though - but I'm unsure how related these are to my current problem. https://github.com/Azure/azure-notificationhubs-dotnet/issues/88 https://github.com/Azure/azure-notificationhubs-dotnet/issues/96

Answer 1

They recently changed their token, you need to make minor changes follow this link https://dev.to/codeprototype/correctly-capture-ios-13-device-token-in-xamarin-1968

Answer 2

I faced same issue, after updating nuget, delete bin & obj + rebuild, and using code in this article works for me --> Xamarin.iOS cannot register with Azure Notification Hub in iOS 13.1.2