Hi @m0skito ,
Thank you for your reply. Have you checked if you use the Server ID?
You have most likely connected to / added the user ID rather than the server ID. On a server OS, there is always a server ID, additionally each user profile will have a unique user ID. The user ID is only online when there is an active RDP session (it also cannot minimised). The server ID is always online and accessible.
To find the server ID, connect to the computer:
(Full version) Help > About
(Host) right click icon in system tray > About TeamViewer
Hope this will help you.
Best regards, Yuri
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