diff --git a/app/api/module/Auth/src/Adapter/LdapAdapter.php b/app/api/module/Auth/src/Adapter/LdapAdapter.php
index 24588645a9..d134dafc70 100644
--- a/app/api/module/Auth/src/Adapter/LdapAdapter.php
+++ b/app/api/module/Auth/src/Adapter/LdapAdapter.php
@@ -92,7 +92,10 @@ public function resetPassword(string $identifier, string $newPassword): bool
      */
     public function register(string $identifier, string $password, string $email, array $attributes = []): void
     {
-        $attributes = array_merge(['email' => $email], $attributes);
+        // The `sn` attribute is required while using the object class `inetOrgPerson`.
+        // This is a local authentication adapter so the data in the `sn` field isn't important.
+        $attributes['sn'] = $identifier;
+
         $this->client->register($identifier, $password, $attributes);
     }
 
diff --git a/app/api/module/Auth/src/Adapter/LdapAdapterFactory.php b/app/api/module/Auth/src/Adapter/LdapAdapterFactory.php
index 2d3b059b83..4b3407b8a4 100644
--- a/app/api/module/Auth/src/Adapter/LdapAdapterFactory.php
+++ b/app/api/module/Auth/src/Adapter/LdapAdapterFactory.php
@@ -12,8 +12,14 @@ class LdapAdapterFactory implements FactoryInterface
 {
     public function __invoke(ContainerInterface $container, $requestedName, array $options = null): LdapAdapter
     {
+        /**
+         * @var Client $client
+         */
         $client = $container->get(Client::class);
 
+        // Using an object class without a `userAccountControl` attribute.
+        $client->setUserAccountControlAttribute(null);
+
         return new LdapAdapter($client);
     }
 }