Do you use a hotas ? Can you turn your head with the "hat" button ?
In Falcon OF, it seems that you must plugin the hotas to make freetrack work.
Maybe it's the same with RV
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My settings with OF
Setup/controller/advanced
3D cockpit movement > panning
[x] Sticky 3D snapview
[x] Clickable 3D cockpit
[ ] Enable external mouselook
[ ] Enable force feedback
[x] Enable roll linked NWS
[ ] Enable custom axis shaping
[x] Enable 3D cockpit trackir
[ ] Enable 2D cockpit trackir
[x] enable trackir vector
Trackir vector axis mode > z axis
I hope it can help