public async Task <IActionResult> OnPostAsync(bool rememberMe, string returnUrl = null) { if (!ModelState.IsValid) { return(Page()); } returnUrl = returnUrl ?? Url.Content("~/"); var userId = await _authenticatorService.GetAuthenticationUserId(); if (String.IsNullOrEmpty(userId)) { throw new InvalidOperationException($"Unable to load two-factor authentication user."); } var authenticatorCode = Input.TwoFactorCode.Replace(" ", string.Empty).Replace("-", string.Empty); var result = await _authenticatorService.SignInAsync(authenticatorCode, rememberMe, Input.RememberMachine); if (result.Succeeded) { _logger.LogInformation("User with ID '{UserId}' logged in with 2fa.", userId); return(LocalRedirect(returnUrl)); } else { _logger.LogWarning("Invalid authenticator code entered for user with ID '{UserId}'.", userId); ModelState.AddModelError(string.Empty, "Invalid authenticator code."); return(Page()); } }