APNs Token Works with Twilio but Fails with Azure Notification Hubs

[Desierra90]

I am currently facing an issue where a device token (APNs) works perfectly when used with Twilio (We're migrating to Azure), but fails when I register it with Azure Notification Hubs. Here's tghe code that shows the registration and notification sending in my .NET application using Azure Notification Hubs. The goal is to send a direct notification to a device using its APNs token. My device token looks something like this: "1e135b31225f2e03f4489d1bb90e3ee09bc19bac34aaeb01936fa8a0b9d34f73"

using Microsoft.Azure.NotificationHubs;
using System;
using System.Reflection;
using System.Threading.Tasks;

class Program
{
  private static string connectionString = "my_connection_string";
  private static string hubName = "my_hub_name";

static async Task Main(string[] args)
{
    string deviceToken = "my_device_token"; // PNS handle
    await RegisterDeviceToken(deviceToken);
    await SendDirectNotificationToPnsHandle(deviceToken);
}

public static async Task RegisterDeviceToken(string deviceToken)
{
    var hub = NotificationHubClient.CreateClientFromConnectionString(connectionString, hubName);

    try
    {
        var registrationId = await hub.CreateRegistrationIdAsync();
        var jsonBody = "{\"aps\": {\"alert\": \"Hello from Azure\"}}";
        var registrationDescription = new AppleTemplateRegistrationDescription(deviceToken, jsonBody)
        {
            RegistrationId = registrationId
        };

        var upsertedRegistration = await hub.CreateOrUpdateRegistrationAsync(registrationDescription);
        Console.WriteLine($"Registration successful. Registration ID: {upsertedRegistration.RegistrationId}");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Failed to register device token: {ex.Message}");
    }
}

public static async Task SendDirectNotificationToPnsHandle(string deviceToken)
{
    var hub = NotificationHubClient.CreateClientFromConnectionString(connectionString, hubName);
    string notificationPayload = "{\"aps\":{\"alert\":\"Hello, this is a test notification!\"}}";

    try
    {
        var outcome = await hub.SendDirectNotificationAsync(new AppleNotification(notificationPayload), deviceToken);
        Console.WriteLine("Notification sent");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Failed to send notification: {ex.Message}");
    }
}

When I attempt to send a notification through Azure Notification Hubs using the above code, the notifications do not reach the device, even though the same token works when sending notifications via Twilio. The error I get from Azure Notification Hubs indicates an invalid handle, which suggests something might be wrong with the token or the way Azure handles it:

As you can see I get a The Push Notification System handle for the registration is invalid error when using the Test Send tool in the Azure Portal.

However when I run my code i get the following result from the method GetNotificationOutcomeDetailsAsync():

Questions for the Community:

• Is there a known issue with Azure Notification Hubs handling APNs tokens differently than Twilio?
• Could there be a configuration issue on the Azure side that I might be overlooking?
• Are there additional diagnostics or logs that I can enable in Azure to get more detailed error information?

Any suggestions on how to troubleshoot or resolve this issue would be greatly appreciated.

[dijonsmit]

I am having the same issue when using SendDirectNotificationAsync to send to Apple or Android.

I can send the message to the device token from firebase console and i received the message, if i use the SendDirect.. then all i get back is a tracking id and the outcome values for Failuew and success is 0.

Everything works fine if is send the message via "SendFcmV1NativeNotificationAsync" or "SendAppleNativeNotificationAsync"