Fix #11337

app/Http/Controllers/ProfileController.php

@@ -113,6 +113,8 @@ class ProfileController extends Controller
             throw new FireflyException('Invalid token.');
         }
         $repository->unblockUser($user);
+        // also remove the "remote_guard_alt_email" preference.
+        Preferences::delete('remote_guard_alt_email');
 
         // return to log in.
         session()->flash('success', (string) trans('firefly.login_with_new_email'));