Ticket #38962: 38962.diff

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

@@ -676 +676 @@
                 $reassign = isset( $request['reassign'] ) ? absint( $request['reassign'] ) : null;
                 $force    = isset( $request['force'] ) ? (bool) $request['force'] : false;
 
+                // We don't support delete requests in multisite.
+                if ( is_multisite() ) {
+                        return new WP_Error( 'rest_cannot_delete', __( 'The user cannot be deleted.' ), array( 'status' => 500 ) );
+                }
+
                 // We don't support trashing for users.
                 if ( ! $force ) {
                         return new WP_Error( 'rest_trash_not_supported', __( 'Users do not support trashing. Set force=true to delete.' ), array( 'status' => 501 ) );