public abstract class BaseController : ControllerBase
{
    public int LoggedInUserId
    {
        get
        {
           Task<int> task = Task.Run(async () => await GetLoggedInUserId());
           return task.Result;
        }
    }
}

[Route("api/[controller]")]
[ApiController]
public class UsersController : BaseController
{
    public UsersController()
    {

    }

    [HttpPost("create")]
    public async Task<ActionResult<User>> Create([FromBody] userCreate)
    {
        _userService.CreateUser(userCreate, LoggedInUserId);
    }
}

_userService.CreateUser(userCreate, await GetLoggedInUserId());