Issue #3384264 by bserem: You have requested a non-existent service "entity.manager"

src/Form/NotifyExtendForm.php

@@ -51,7 +51,7 @@ class NotifyExtendForm extends FormBase {
    */
   public static function create(ContainerInterface $container) {
     return new static(
-      $container->get('entity.manager')->getStorage('node'),
+      $container->get('entity_type.manager')->getStorage('node'),
       $container->get('config.factory')
     );
   }