post request niepoprawnie zwracany wynik akcji

mój kontroller, pikam pod ten endpoint postmanem i dostaję pusty obiekt {}
response jest łądnie wypełniony.
dlaczego?

[HttpPost("login")]
public ActionResult<AuthenticateResponse> Login([FromBody]LoginDto dto)
{
    User user = _accountService.LoginUser(dto);
    string token = _accountService.GenerateJwt(user);

    AuthenticateResponse response = AuthenticateResponse.Ok(UserDto.of(user, token));

    return response;   
}

public class AuthenticateResponse
{
    UserDto user;
    string error;

    public static AuthenticateResponse Ok(UserDto user)
    {
        AuthenticateResponse response = new AuthenticateResponse();
        response.user = user;

        return response;
    }
    public static AuthenticateResponse Error(string error)
    {
        AuthenticateResponse response = new AuthenticateResponse();
        response.error = error;

        return response;
    }
}

Zamień

UserDto user;
string error;

na

public UserDto user { get; set; }
string error { get; set; }

Dodatkowo polecam zrobić tak:

[HttpPost("login")]
public IActionResult Login([FromBody]LoginDto dto)
{
    User user = _accountService.LoginUser(dto);
    string token = _accountService.GenerateJwt(user);
    return Ok(AuthenticateResponse.Ok(UserDto.of(user, token))) ;  
}