Unreal Engine Livestream - Introducing the FaceAR- August 9 - Live from Epic HQ

We have followed the instructions and have everything running.
However the Livelink does not seem to be activated: the Windows 10 app does not show any updates the iOS app should be sending out. iOS does detect the face and updates within the app.
-> Both machines are on the same network and should be able to see each other. (Check with a small setup using OSC communication)
-> Tried this in 4.20.3 and 4.22.1
Do we need to add any special rules to the (Windows default) firewall?

In the docs (Face AR Sample | Unreal Engine Documentation) it says:
"Launch your Project, and in Project Settings set Supports AR to On."
Searched back and forth but I cannot find this setting in the project settings, can this be the cause?

Thanks in advance for any tips which will push uis in the right direction towards a working setup.