Sending emails at activities to the administrator

Where the administrator of a poll has to check a box in order to immediately get notification when an activity by a participant has taken place?

Right on the vote page under the vote table is a checkbox.
The notifications are sent via email every 10 minutes via cronjob.

This box is being checked. But I do not receive notifications.

Please check, if cron is running.

Cron wasn’t activated but AJAX.

The notifications are sent out via cron job. I am not familiar with the ajax variant. At least a webcron is recommented, if system cron is not available.

Notifications on poll updates are executed every 10 minutes (depending of the cron timing).