From a native RDP session, an administrator can use Windows Terminal Server Admin control panel (tsadmin.msc) to remote control other users' sessions. However, when trying to do this from a KRC private session, the screen freezes.
The problem has been documented.
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Use KRC built-in feature to remote control terminal server sesions.
Please note, this requires a change to Windows default GPO settings, as described here.
Kaseya Remote Control (KRC) - R8.0 and later