RDP Terminal Services Licensing

To configure a server to use a Windows Remote Desktop Licensing server. On the server that needs licensing, configure to point to the licensing server.

gpedit

Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Licensing

Use the specified Remote Desktop license servers : Enable : servername.domain.com

Set the Remote Desktop licensing mode : Enable : Per User

Reference : https://www.wintips.org/how-to-install-remote-desktop-services-terminal-services-on-server-2016-2012/