MVVM Toolkit Messenger - RequestMessage

public class AsyncRLoginMsgReq : AsyncRequestMessage<bool>{};

public class LoginRequestProcessor{
    public readonly IMessenger Messenger;
    
    public LoginRequestProcessor(IMessenger messenger) { 
        Messenger = messenger;
    }

    public void RegisterAll() {
        //                                     \/
        Messenger.Register<AsyncRLoginMsgReq>(this, (r, m) =>
        {
            // NEVER EXECUTED
            m.Reply(Task.FromResult(true));
        });
        //                                     \/
        Messenger.Register<AsyncRLoginMsgReq>(Messenger, (r, m) =>
        {
            // EXECUTED
            m.Reply(Task.FromResult(true));
        });
    }

}

// some other class
var r = await _messenger.Send(new AsyncRLoginMsgReq());