How to call SignalR client(javascript) from background services like from API on other port?

Question

I am using @microsoft/signal on client end and azure Signalr on server end.

I did called SendAsync() from other api but its not worked for me.

Startup.cs:

services.AddSignalR().AddAzureSignalR();

app.UseAzureSignalR(routes =>
        {
            routes.MapHub<MyHub>("/my");
        });

ITypedHubClient.cs:

public interface ITypedHubClient
{
    Task BroadcastMessage(string name, string message);
}

MyHub.cs:

    public class MyHub: Hub<ITypedHubClient>
     {
          public void Send(string name, string message)
          {
               this.Clients.All.BroadcastMessage(name, message);
          }
     }

In Service(Other API service which is in different port than signalR client):

    private readonly IHubContext<MyHub, ITypedHubClient> hubContext;

   // After record will be updated 
   hubContext.Clients.All.BroadcastMessage("RefreshDetails", "test");

In javascript client:

        var connection = new signalR.HubConnectionBuilder().withUrl("/my").withAutomaticReconnect().build();

        connection.on("BroadcastMessage", function (params) {
           //TODO
        }