diff --git a/core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php b/core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php
index de061a6e36..b9b855d55c 100644
--- a/core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php
+++ b/core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php
@@ -405,6 +405,7 @@ protected function getUser($name) {
       $user = $user_storage->create([
         'name' => $name,
         'status' => 1,
+        'mail' => mb_strtolower(str_replace(' ', '.', $name)) . '@example.com',
       ]);
       $user->enforceIsNew();
       $user->save();