Apple Configurator 2 VPN profile with pre shared key

I have created a mobileconfig profile several months ago. Now I'm trying to create another but I cannot type in pre shared key in the profile.

When I create new profile in Apple configurator and configure VPN I can choose from "Machine authentication" "Shared Secret" but there is no place to type in the key. I know this must be possible because I have done this before but now I can't figure out how?

I'm using macOS Catalina.