I've read and followed the entire thread here:
Nothing here, including the supposed "solution" works.
Other things I've tried:
Running ST mode
Re-installing Tobii Gamehub
Deleting the Tobii Cache
Repairing DCS
I know the Tobii hardware and software are working - I've got Tobii Ghost enabled as I write this. I can also re-calibrate it without issue. I also tested it in Star Citizen & MSFS and I can confirm it works perfectly there. In DCS it shows up under my controls with assignments, it just... won't.... work...