Sorry but I dont know how to take screenshots in VR bit I see simply a white square with two zig zag black lines (upside down “w” shapes that look like a mountain skyline).
You could also try a long press on the oculus hand controller menu button … it may bring up a menu where you also see this icon to click to switch to the Sim.
It may be something completely different causing your issue… fingers crossed… hope ot works for you.