Okay folks, here's the deal if you have an XR Elite and want passthrough.
Download Vive Business Streaming. Install the Business Streaming app on your XR Elite. Enable passthrough in business streaming settings. You also have to open business streaming from the headset library, it won't just connect if you select PC apps in the Vive menu.
Now go to SLR and open a passthrough video and enable passthrough once it starts playing.
If you have a handy, prepare for the best thing next to the real thing.
I'm not much for verbosity but if you have questions find me on the handy reddit and I'm happy to help. Just know I wouldn't wouldn't spend the premium on this site if this weren't the only way to experience porn.