VR button missing on cospaces

Hi Team,

Ive been using Co spaces for a few years now and I used to use Firefox to run cospaces when i wanted to use my HTC vive. But I have just logged in for the first time to use the VR function. However the button that usually sits at the bottom right corner is not there anymore and I cant for life remember another way to switch my Cospace into VR mode.

Any Help team?