Ticket #40477: 40477.patch

src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php

@@ -507 +507 @@
                 } else {
                         $user_id = wp_insert_user( wp_slash( (array) $user ) );
 
+                        // Trigger admin and user notifications for the new user.
+                        wp_new_user_notification( $user_id, null, 'both' );
+
                         if ( is_wp_error( $user_id ) ) {
                                 return $user_id;
                         }