Article - "Error "Terminal Server Remote Client Not Allowed" or "(-103) Cannot checkout an uncounted license within a windows terminal services guest session"": https://www.ptc.com/en/support/article/CS23456
If application is configured to a locked license, then the application will not launch when connected over a remote Desktop or Terminal Services connection
A locked license file is intended to be used alone, without using any License Management Application, whereas a floating license file is intended to be managed by a License Management Application installed on the server machine.
Check first if License file is Floating or Locked.