diff --git a/src/Umbraco.Web.BackOffice/Security/BackOfficeSignInManager.cs b/src/Umbraco.Web.BackOffice/Security/BackOfficeSignInManager.cs
index 4b970e4b72f9..c043cf73d2b2 100644
--- a/src/Umbraco.Web.BackOffice/Security/BackOfficeSignInManager.cs
+++ b/src/Umbraco.Web.BackOffice/Security/BackOfficeSignInManager.cs
@@ -78,6 +78,7 @@ public async Task<SignInResult> ExternalLoginSignInAsync(ExternalLoginInfo login
                 if (shouldSignIn == false)
                 {
                     Logger.LogWarning("The AutoLinkOptions of the external authentication provider '{LoginProvider}' have refused the login based on the OnExternalLogin method. Affected user id: '{UserId}'", loginInfo.LoginProvider, user.Id);
+                    return SignInResult.NotAllowed;
                 }
             }