Additionally to the central support of the university of Tübingen, you can make use of the bwsupportPortal. The Login to the bwSupportPortal with your ZDV login over the bwIDM infrastructure.
At the DFN-AAI page you need to select your home organiziation. After you input your ZDV-Login-ID and your password, confirm your user attributes and then you will be forwarded to the ticket formular.
You completed the login process now and you can create a new ticket by clicking on the "Submit a new ticket" link.