Por que os métodos Register e Login do AccountController do ASP.NET Identity estão causando erro de rota?

[HttpGet]
        [AllowAnonymous]
        public IActionResult Register(string returnUrl = null)
        {
            ViewData["ReturnUrl"] = returnUrl;
            return View();
        }

        [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Register(RegisterViewModel model, string returnUrl = null)
        {
            ViewData["ReturnUrl"] = returnUrl;
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser { FirstName = model.FirstName,
                    LastName = model.LastName,
                    UserName = model.Email, Email = model.Email,
                    Profile = "user"};
                var result = await _userManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    _logger.LogInformation("User created a new account with password.");
                  //  var code = await _userManager.GenerateEmailConfirmationTokenAsync(user);
                  //  var callbackUrl = Url.Action(nameof(ConfirmEmail), "Account", new { userId = user.Id, code = code }, protocol: HttpContext.Request.Scheme);
                  //  await IEmailSender.SendEmailAsync(model.Email, "Confirm your account", $"Por favor, confirme seu email clicando neste link: <a href=''''>link</a>");
                    await _signInManager.SignInAsync(user, isPersistent: false);
                    _logger.LogInformation("User created a new account with password.");
                    return RedirectToLocal(returnUrl);
                }
                AddErrors(result);
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }

[HttpGet]
        [AllowAnonymous]
        public async Task<IActionResult> Login(string returnUrl = null)
        {
            // Clear the existing external cookie to ensure a clean login process
            await HttpContext.SignOutAsync(IdentityConstants.ExternalScheme);

            ViewData["ReturnUrl"] = returnUrl;
            return View();
        }

        [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Login(LoginViewModel model, string returnUrl = null)
        {
            ViewData["ReturnUrl"] = returnUrl;
            if (ModelState.IsValid)
            {
                // This doesn''t count login failures towards account lockout
                // To enable password failures to trigger account lockout, set lockoutOnFailure: true

                var result = await _signInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, lockoutOnFailure: false);
                if (result.Succeeded)
                {
                    _logger.LogInformation("User logged in.");
                    return RedirectToLocal(returnUrl);
                }
                if (result.IsLockedOut)
                {
                    _logger.LogWarning("User account locked out.");
                    return RedirectToAction(nameof(Lockout));
                }
                else
                {
                    ModelState.AddModelError("InvalidLogin", "O usuário ou senha incorreto.");
                    return View(model);
                }
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }