aspnetcore: SignalR can not get user identifier from ClaimsPrincipal

I use ASP.NET 6 RC1 Angular template.

I try to send message to specific user by user identifier and it doesn’t push message to client.

await storeHub.Clients.User(userId).SendMessage(message);

I realized UserIdentifier is null on user’s connection and i wanted to set via my custom provider. The weird thing is below provider return null as identifier.

    public class UserIdProvider : IUserIdProvider
    {
        public string GetUserId(HubConnectionContext connection)
        {
            return connection.User.FindFirstValue(ClaimTypes.NameIdentifier); //returns null
        }
    }

But the code on controller side is able to find and return identifier as User.FindFirstValue(ClaimTypes.NameIdentifier)

Not sure i missed something in here. I need help 😦