Send message to client by userId by SignalR | .NET 6, Angular

My signalR hub works good. I configure it with simple example.

StartUp.cs

services.AddSignalR();

app.UseEndpoints(endpoints =>  
{  
  endpoints.MapHub<BroadcastHub>("/notify");  
}); 

Interface IHubClient

public interface IHubClient
{
 Task BroadcastMessage();

 Task BroadcastToConnection(string data, string connectionId);

 Task BroadcastToUser(string data);
}

BroadcastHub.cs

public class BroadcastHub  : Hub<IHubClient>
{
  public ClaimsPrincipal GetConnectionId() => Context.ConnectionId;
}

My angular side

ngOnInit(): void {
this.connection = new signalR.HubConnectionBuilder()
  .configureLogging(signalR.LogLevel.Information)
  .withUrl(`${environment.apiUrl}/` + 'notify')
  .build();

this.connection
.start()
.then(function () {
})
.then(() => this.getConnectionId())
.catch(function (err) {
  return console.error(err.toString());
});

this.connection.on("BroadcastToUser", (e) => {
  console.log(e);
});
}

 getConnectionId = () => {
 this.connection.invoke('getconnectionid').then(
   (data) => {
     console.log(data);
      this.connectionId = data;
     }
 ); 
 } 

I can easy send message by connectionId through swagger by this way and it works good

    [HttpGet("signalr/{id}")]
    public async Task<string> Signalr(string id)
    {
        await _hubContext.Clients.Client(id).BroadcastToUser("test");
        return "message send to: " + id;
    }

But I want to send by userId and use this method - UserId I get from context

await _hubContext.Clients.User(UserId).BroadcastToUser("test");

But I don't see any result. As I read on code-mase in this example I need to authenticate users and set the NameIdentifier claim in ClaimsPrincipal

I use Auth web api in my .NET app. My atribute [Authorize(Roles = "User")] works good. I dont understand how I can send message by userId