Cannot send CTRL+Alt+Delete command

I have set up 1 system with Server 2016 Std that i would like to monitor and remote control via the Pulseway features. Everything is setup fine and i can connect to the server via the Remote Desktop Client and the Dashboard. The only thing i cannot do is connect to the Console session because i cannot get the Send Command (from a Windows 10) to work. I can see the Servers Desktop but cannot send the CTRL+Alt+Delete command to start the login process.

I have checked the manual and rebooted the system

/Regards Daniel