Signal R not catching Identity IDs in blazor server

I am trying to implement a chat feature in a blazor solution (.NET 8), the chat is very simple, every user must be able to message every user in a application similar to whatsapp web, this is the Hub

public class ChatHub : Hub{    private readonly ChatService _chatService;    public ChatHub(ChatService chatService)    {        _chatService = chatService;    }    public async Task SendMessage(string receiverId, string message)    {        var senderId = Context.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;        await _chatService.SaveMessageAsync(senderId, receiverId, message);        await Clients.User(receiverId).SendAsync("ReceiveMessage", senderId, message);    }}

the problem I am having is that the line:

 var senderId = Context.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;

is always returning null, after some research I found out that ClaimTypes.NameIdentifier in this context could not be returning null as the id it's going to return is the id I need to point to the signal R client I am trying to connect, therefore hardcoding the Identity ID or using the connection Id from Signal R also did not work

I tried setting the Identity Ids to Signal R IDs using this

public class NameIdentifierUserIdProvider : IUserIdProvider{  public string GetUserId(HubConnectionContext connection)  {    return connection.User?.FindFirst(ClaimTypes.NameIdentifier)?.Value;  }}

builder.Services.AddSingleton<IUserIdProvider, NameIdentifierUserIdProvider>();

I tried hardcoding the Identity IDs in the hub for testing also without success

tried also using the signal R connection IDs directly like this

public override async Task OnConnectedAsync(){    var userId = Context.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;    if (!string.IsNullOrEmpty(userId))    {        _userConnectionMap.TryAdd(userId, Context.ConnectionId);    }    await base.OnConnectedAsync();}public async Task SendMessage(string receiverId, string senderId, string message){    await _chatService.SaveMessageAsync(senderId, receiverId, message);    if (_userConnectionMap.TryGetValue(receiverId, out string connectionId))    {        await Clients.Client(connectionId).SendAsync("ReceiveMessage", senderId, message);    }}