We have deployed some kiosks with Win10 LTSC (2019). When remote connecting to these kiosks the display for the Tech is blank until the tech clicks on the screen. Mouse movements and keyboard work correctly, but do not disable the blank screen, only clicking the mouse or blanking/unblanking the guest screen shows the guest screen to the host. This bug happens every time you connect to the affected guest machine, closing the control window and immediately reconnecting to the same guest results in blank screen. I believe that it may be related to running Chrome in --kiosk mode as closing Chrome on the affected machine and rejoining the session does not blank the screen and restarting Chrome in --kiosk mode exhibits the same behavior.
Customer support service by UserEcho