does anybody know how to make playspace mover space drag work with a WMR/knuckles/fbt hybrid?

I use HP Reverb G2 with Knuckles controllers and 2x2.0 base stations with 3xHTC trackers. everything works fine except I can't space drag.

If I connect only the WMR controllers and not any of the hybrid stuff, I'm able to space drag.

If I connect the knuckles first and then turn on the WMR controllers, neither can space drag.

how to solve this?