Unable to view VR 360 in Oculus Rift or Quest HMD in Premiere Pro

[#1]

I was able to view 360 video in my Oculus Quest until a short while ago. And then I couldn't. It's possible the latest Steam VR update disabled this function. Need this resolved urgently. Adobe Immersive Playback is checked on. Steam VR app is open. But I can't get the 360 video in Premiere to playback in the headset.  I also tried with my Oculus Rift but that did not work either. 

[#2 · Accepted solution]

Solved. Somehow Adobe Immersive Environment was switched off in Premiere Pro's Program monitor. After I turned it back on I could watch the 360 video clips in my timeline in my HMD - in both Rift and Quest.