Do SteamVR headsets, like the HTC Vive, not work with A-Frame and WebVR or WebXR anymore?

Question

I have been struggling for a while to get my A-Frame scenes to display in my VR headset through SteamVR. Simply put, my goal is to find a way to get A-Frame projects to properly display on my headset, but instead my headset receives no feed from the A-Frame scene and displays a solid grey or black color. Here's the odd part: sometimes, I can get the A-Frame scene to show up on the SteamVR VR View window on my desktop, but when I put my headset on, the display is still greyed or blacked out. Unfortunately, no errors were encounter (so far) in the console log of the browser I tried running the A-Frame scenes in.

Important to mention, the HTC Vive Headset and OptiTrack Equipment do work. They work for Unity programs and other VR applications. They are just not working with WebVR, WebXR, and A-Frame programs.

Usually what occurs is when I open up the A-Frame scene in a web browser tab manually or by using http-server and ngrok, the scene runs fine on the desktop monitor. However, it then proceeds to open up SteamVR and attempts to connect to my headset. SteamVR will usually say Playing Firefox or Playing Chrome. Sometimes the A-Frame scene appears on the VR View of the SteamVR application, but every time I try this the headset display is blacked or greyed out. That's as far as I can get.

Equipment:

• HTC Vive Pro Eye (w/ OptiTrack Active Tag Attachment and Wireless Adapter)
• OptiTrack IR Cameras (not using base stations)
• HP Z4 Desktop Workstation Computer

Here's what I've tried so far:

• Enabling web xr and vr flags in browsers like Chrome, Chromium, Firefox, Edge, and Firefox Nightly (However, for browsers like Chrome, I couldn't find the web vr or xr flags anywhere)
• Disabling xr sandbox in the web browsers that provided the option to enable/disable xr sandbox
• Trying beta versions of SteamVR
• Using a mixed reality HP headset (The one that comes with the backpack VR computer) with Edge
• Trying different release versions of A-Frame
• Tried using Supermedium, which some have recommended, but I don't think opens A-Frame scenes...

I would paste error and code snippets, but for this scenario it wouldn't make sense since no errors pop up and it's very unlikely that the issue is from the HTML/JavaScript A-Frame code. Thank you for taking the time to read and consider this issue! If you need any other details I'll provide them here so just let me know.