RC won't connect to Flight simulation??

[Hatman30]

I open up the DJI assistant app, the Mavic connects fine, the remote control flicks to USB for like two seconds and then it just switches straight back to Atti/gps mode, meaning I am unable to use it for flying in the simulation. I've tried a combination of things -turning on the remote first / last etc and none of them seem to work. Any help would be very much appreciated . Thx