Not receive notification with azure notification hub when using tag - azure-notificationhub

Question

I'm new to this. The example of android is from
GetStartedFirebase
Below are the steps:
1) I install the android to my phone
2) I followed this example to create my web api
https//learn.microsoft.com/en-us/azure/notification-hubs/notification-hubs-aspnet-backend-gcm-android-push-to-user-google-notification
3) i comment out the AuthenticationTestHandler class
4)i call the below code from fiddle
The DeviceRegistration object
{
"Platform": "gcm",
"Handle": "regid i get from android",
"Tags": [
"1",
"2"
]
}
// This creates or updates a registration (with provided channelURI) at the specified id
public async Task<HttpResponseMessage> Put(string id, DeviceRegistration deviceUpdate)
{
RegistrationDescription registration = null;
switch (deviceUpdate.Platform)
{
case "mpns":
registration = new MpnsRegistrationDescription(deviceUpdate.Handle);
break;
case "wns":
registration = new WindowsRegistrationDescription(deviceUpdate.Handle);
break;
case "apns":
registration = new AppleRegistrationDescription(deviceUpdate.Handle);
break;
case "gcm":
registration = new GcmRegistrationDescription(deviceUpdate.Handle);
break;
default:
throw new HttpResponseException(HttpStatusCode.BadRequest);
}
registration.RegistrationId = id;
var username = "test";
string[] userTag = new string[1];
userTag[0] = "username:" + username;
registration.Tags = new HashSet<string>(userTag);
try
{
await hub.CreateOrUpdateRegistrationAsync(registration);
}
catch (MessagingException e)
{
ReturnGoneIfHubResponseIsGone(e);
}
return Request.CreateResponse(HttpStatusCode.OK);
}
5) Then i call to send the push notification
http://localhost:4486/api/Notifications?pns=gcm&to_tag=test
public async Task<HttpResponseMessage> Post(string pns, [FromBody]string message, string to_tag)
{
var user = "test";
message = "msg";
string[] userTag = new string[1];
userTag[0] = "username:" + to_tag;
Microsoft.Azure.NotificationHubs.NotificationOutcome outcome = null;
HttpStatusCode ret = HttpStatusCode.InternalServerError;
switch (pns.ToLower())
{
case "wns":
// Windows 8.1 / Windows Phone 8.1
var toast = #"<toast><visual><binding template=""ToastText01""><text id=""1"">" +
"From " + user + ": " + message + "</text></binding></visual></toast>";
outcome = await Notifications.Instance.Hub.SendWindowsNativeNotificationAsync(toast, userTag);
break;
case "apns":
// iOS
var alert = "{\"aps\":{\"alert\":\"" + "From " + user + ": " + message + "\"}}";
outcome = await Notifications.Instance.Hub.SendAppleNativeNotificationAsync(alert, userTag);
break;
case "gcm":
// Android
var notif = "{ \"data\" : {\"message\":\"" + "From " + user + ": " + message + "\"}}";
outcome = await Notifications.Instance.Hub.SendGcmNativeNotificationAsync(notif, userTag);
break;
}
if (outcome != null)
{
if (!((outcome.State == Microsoft.Azure.NotificationHubs.NotificationOutcomeState.Abandoned) ||
(outcome.State == Microsoft.Azure.NotificationHubs.NotificationOutcomeState.Unknown)))
{
ret = HttpStatusCode.OK;
}
}
return Request.CreateResponse(ret);
}
No error returned but i do not receive any notification.
I try to remove usertag as below:
outcome = await Notifications.Instance.Hub.SendGcmNativeNotificationAsync(notif);
I am able to receive the notification.
Why the tag doesn't work ?
Any help appreciated.

Answer 1

var allRegistrations = await Notifications.Instance.Hub.GetAllRegistrationsAsync(0);
Check your tag in allRegistrations. If it is there then it should work.
You can check test notification from http://pushtry.com

Answer 2

I'm confused - JSON from Fiddler shows that the registration has "1" and "2" tags, but everywhere in the code you are using "username:test" tag. Can you get this registration from the hub and make sure that it has correct tags?
You can use GetRegistrationAsync<TRegistrationDescription>(String) [1], GetRegistrationsByChannelAsync(String, Int32) [2] or GetAllRegistrationsAsync(Int32) [3] methods to get the registration.
[1] https://learn.microsoft.com/en-us/dotnet/api/microsoft.azure.notificationhubs.notificationhubclient#Microsoft_Azure_NotificationHubs_NotificationHubClient_GetRegistrationAsync__1_System_String_
[2] https://learn.microsoft.com/en-us/dotnet/api/microsoft.azure.notificationhubs.notificationhubclient#Microsoft_Azure_NotificationHubs_NotificationHubClient_GetRegistrationsByChannelAsync_System_String_System_Int32_
[3] https://learn.microsoft.com/en-us/dotnet/api/microsoft.azure.notificationhubs.notificationhubclient#Microsoft_Azure_NotificationHubs_NotificationHubClient_GetAllRegistrationsAsync_System_Int32_