admin menu per admin | group admin | group member; ouatt_users curom module

src/web/modules/custom/ouatt_users/ouatt_users.info.yml

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+name: Où Atterrir Users
+type: module
+description: 'Où Atterrir Users.'
+package: Ouatterrir
+core: 8.x
+# dependencies:
+#   - user
+core_version_requirement: ^8 || ^9

src/web/modules/custom/ouatt_users/ouatt_users.module

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+<?php
+
+/**
+ * @file
+ * Contains admin_menus.module.
+ */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function ouatt_users_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    // Main module help for the editors_menus module.
+    case 'help.page.ouatt_users':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('Où Atterrir users twicks module') . '</p>';
+      return $output;
+
+    default:
+  }
+}
+
+
+/**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function ouatt_users_form_user_register_form_alter(&$form, $form_state, $form_id) {
+  $curuser = \Drupal::currentUser();
+  $curroles = $curuser->getRoles();
+  if ( in_array('group_admin', $curroles) && !in_array(['admin', 'root'], $curroles) ){
+    // role. Group admin can only create "groupe member" user
+    $form['role_change']['widget']['#default_value'] = ['group_member'];
+    $form['role_change']['#disabled'] = true;
+    $form['role_change']['#attributes']['class'][] = 'js-hide';
+    // status. Always active
+    $form['account']['status']['#default_value'] = 1;
+    $form['account']['status']['#disabled'] = true;
+    $form['account']['status']['#attributes']['class'][] = 'js-hide';
+  }
+
+}