Doubt about using Identity in layers

Question

I created an Aspnet MVC project with Identity to understand how the Identity part works. I made changes to the code, including roles and Claims. I switched this project to a company project, but the project is all done in layers (MVC, Business, Repository, DAL). The problem now is that I am not managing to pass the data to business layer - Repository - DAL. When I debug the code in the Login method, my Signinmanager method always returns "Null". Can anyone help me ? I’m new in the area and I can’t solve the problem.

//
    // POST: /Account/Login
    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Login(LoginViewModel model, string returnUrl)
    {
        if (!ModelState.IsValid)
        {
            return View(model);
        }

        var result = await SignInManager.PasswordSignInAsync(model.UserName, model.Password, model.RememberMe, shouldLockout: true);
        switch (result)
        {
            case SignInStatus.Success:
                var user = await UserManager.FindAsync(model.UserName, model.Password);
                await SignInAsync(user, model.RememberMe);
                return RedirectToLocal(returnUrl);
            case SignInStatus.LockedOut:
                return View("Lockout");
            case SignInStatus.RequiresVerification:
                return RedirectToAction("SendCode", new { ReturnUrl = returnUrl });
            case SignInStatus.Failure:
            default:
                ModelState.AddModelError("", "Login ou Senha incorretos.");
                return View(model);
        }
    }