Viewing models in Chrome using SteamVR Beta

I’m trying to view models in Chrome on my HTC Vive using the SteamVR Beta. I have Chrome 92.0.4515.159 and SteamVR Beta 1.19.7.

I have tried setting the Chrome flags but the only the webxr-runtime one is listed and the webxr one isn’t. There’s webxr-incubations which I have enabled along with setting the webxr-runtime to “OpenXR”. Clicking the view in VR button in Sketchfab while SteamVR is running just brings up a notification in my headset saying “Google Chrome 92: Next up” but nothing actually loads.

Am I missing something?