Tobii not activating

Hello All
I was using Tobii frequently with MSFS 2020 and with my old PC. Now I switched to a new PC and reinstalled everything. Including Tobii - calibrated and everything ready.
In the MSFS 2020 settings the headtracking toggle is “/” within the numpad - which is what I had with the old PC.

Now, on the new PC when I hit / it would not start tobii. But the sim “sees” tobii as in the control settings tobii is present.

What am I missing here guys/gals?

Check this thread for several tips/tricks and some fixes that worked for some of us before.

Thanks mate! will do!

Unfortunately that won’t help - I have never had any other facetracking software installed - this is a brand new PC - tobii the first/only headtracker…