To whom should I submit my request?
It depends on the topic.
If you have any commercial (f.e. license) question please contact our sales team via https://www.univention.com/contact/
If you have no support subscription you can drop your questions and problems in our forum.
If you have a tam or bought a customer expansion, and you have questions about it, you should have a contact to our professional services team.
If you have a support subscription open a ticket for our support team via webfrontend or via mail; in doubt open a ticket and the support team will take car for the right place to drop your request.