You must use the Programs and Features interface in the Windows Control Panel to install Operations Sentinel so that Terminal Services can properly recognize and condition the installation.

It is recommended that you install Operations Sentinel from the local console of the Terminal Services server and not from a Terminal Services session. However, you must use Remote Desktop for Administration if you are installing on a Windows 11, Windows 10, Windows 8.1, Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows Server 2012, and Windows Server 2012 R2.

If you are uninstalling Terminal Services, you must first uninstall Operations Sentinel and then reinstall Terminal Services first to properly condition the Operations Sentinel installation.