Teamviewer on RHEL 7.3 quits when I try to connect from Windows PC

I have Teamviewer 12.0.76279 installed on a RHEL 7.3 Server. I set up an User "Fern" to automatically by login to start TV. But when I try to connect from my Windows Workstation it just quits and closes the GUI. I tried it with user "root" and it worked fine. What am I missing here?