Ok, your notifier is not working at all.
Please check the file /var/lib/univention-ldap/listener/listener. Is it empty (size =0)?
If so, follow the steps in this article.
The article related to this issue in 4.4 is currently in development. In case you have a support contract, please open a ticket. Otherwise you will have to wait until we will make this article public. I guest this is done within the next week or so.
/CV