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Xmarin.IOS Remote Notification Stop Working the remote notification stop working after after March 31, 2021. after we receive the below message the notification stop working Please see it : The HTTP/2‑based Apple Push Notification service (APNs) provider API lets you take advantage of great features, such as authentication with a JSON Web Token, improved error messaging, and per‑notification feedback. If you still send push notifications with the legacy binary protocol, make sure to upgrade to the APNs provider API as soon as possible. APNs will no longer support the legacy binary protocol after March 31, 2021. We send push notifications to Xamarin.iOS apps using Azure Notification Hubs , After a lot of checking we found some code become not work correct when use Hub.UnregisterAllAsync the call back not worked Please see the code we need your help. Thanks public override void RegisteredForRemoteNotifications** (UIApplication application, NSData deviceToken) { Hub = new SBNotificationHub (ApplicationParameter.NotificationConnectionString, ApplicationParameter.NotificationHubPath); Hub.UnregisterAllAsync (deviceToken, (error) => { **if (error != null) return; var tags = new List<string> { ApplicationHelper.GetTag () }; Hub.RegisterNativeAsync (deviceToken, new NSSet (tags.ToArray ()), (errorCallback) => { if (errorCallback != null) Console.WriteLine ("RegisterNativeAsync error: " + errorCallback.ToString ()); }); }); }