Had the same. A windows updated (or my virusscanner(?) has removed a microsoft Visual C+ library. Install this again and Steam VR works again… You can also try to reinstall the Windows Mixed Reality for steam VR software and/or SteamVR.
Which c+ library?? I Uninstalled all 3 things then reinstalled windows mixed really steamvr and windows mixed reality for steam vr and still same issue.
In MSFS you don’t need steamvr for the reverb. Set under windows settings/mixed reality/startup and desktop/automatic startup the steamVR option off.
You can still use OpenXR in MSFS then.
Sadly Mbucchia has stopped the development of OpenXR. So the discord server is closed.
This does work but some people like me use steamvr for other things they need like obs screen recording of MSFS. And for fpsvr which is very handy to see how the GPU CPU mem are doing with settings in MSFS.
Any solution to screen recording that is like OBS with steamVR or OBS for WMR openXR would help the situation especially since openxr toolkit can kind of help with settings but not as good as fpsvr.