protected function getUserAccountName(NotificationInterface $notification, $keyInData = 'uid')
    {
        $names = [];
        $count = 0;

        if (isset($notification[$keyInData])) {

            $uidList  = $notification[$keyInData];
            $count    = count($uidList);

            if (!is_array($uidList)) {
                $uidList = [$uidList];
            }

            $names = array_map('format_username', user_load_multiple($uidList));
        }

        if (empty($names)) {
            return;
        }

        if ($count) {
            return $this->getTitleString($names, $count);
        }
    }