Hi,
RadiAnt with its current licensing system can work in a terminal server environment, provided that the desktops are persistent. That is, the hardware ID detected by RadiAnt does not change between sessions. Otherwise, it will be hard (or even impossible) for the activations to work as supposed.
Soon we will implement a licensing system designed specifically for terminal server environments. There will be one license server leasing RadiAnt licenses from the purchased pool to connected clients.
Please contact us directly at
https://www.radiantviewer.com/contact/ and we will see if your issue can be resolved until the new licensing model is available.