diff --git a/core/modules/user/src/AccountSettingsForm.php b/core/modules/user/src/AccountSettingsForm.php
index b76897d..e714884 100644
--- a/core/modules/user/src/AccountSettingsForm.php
+++ b/core/modules/user/src/AccountSettingsForm.php
@@ -451,6 +451,8 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
       ->set('register_no_approval_required.subject', $form_state->getValue('user_mail_register_no_approval_required_subject'))
       ->set('register_pending_approval.body', $form_state->getValue('user_mail_register_pending_approval_body'))
       ->set('register_pending_approval.subject', $form_state->getValue('user_mail_register_pending_approval_subject'))
+      ->set('register_pending_approval_admin.body', $form_state->getValue('register_pending_approval_admin_body'))
+      ->set('register_pending_approval_admin.subject', $form_state->getValue('register_pending_approval_admin_subject'))
       ->set('status_activated.body', $form_state->getValue('user_mail_status_activated_body'))
       ->set('status_activated.subject', $form_state->getValue('user_mail_status_activated_subject'))
       ->set('status_blocked.body', $form_state->getValue('user_mail_status_blocked_body'))
diff --git a/core/modules/user/src/Tests/UserAdminSettingsFormTest.php b/core/modules/user/src/Tests/UserAdminSettingsFormTest.php
index 904cea4..57bfb8e 100644
--- a/core/modules/user/src/Tests/UserAdminSettingsFormTest.php
+++ b/core/modules/user/src/Tests/UserAdminSettingsFormTest.php
@@ -37,6 +37,16 @@ protected function setUp() {
         '#config_name' => 'user.mail',
         '#config_key' => 'cancel_confirm.subject',
       ),
+      'register_pending_approval_admin_body' => array(
+        '#value' => $this->randomString(),
+        '#config_name' => 'user.mail',
+        '#config_key' => 'register_pending_approval_admin.body',
+      ),
+      'register_pending_approval_admin_subject' => array(
+        '#value' => $this->randomString(20),
+        '#config_name' => 'user.mail',
+        '#config_key' => 'register_pending_approval_admin.subject',
+      ),
     );
   }
 }