Here’s an easy way to view RDP sessions for other servers from the command line and log them off if you need to. The only requirement for this is that you are a domain admin.
From an elevated command prompt, run the below the command, replacing <server> with the hostname or FQDN of the server you want to view the sessions of.
This will show you a list of all sessions logged into that server.
If you want to logoff one of these sessions, run the below the command replacing <session ID> with the session ID which you want to logoff, which is shown in the above command.
logoff /server:<servername> <session ID> /v
This will then log off the session.
Hope this helps!