Yep, I gave up on the SteamVR runtime a long time ago. But for completeness:
I also tried without “use latest preview” in OXR Dev tools, but get the same behavior.
And here’s the full log from MSFS startup to (failed) attempt at entering VR. No further logs get generated if I continue to attempt entering VR.
Edit: Also possibly relevant… I’m on 1.21.18.0 (SU7 patch beta-2) and running nvidia 497.09
Something that could be related, since I don’t know which pieces of the NVidia code base the NIS functionality relies upon, but I install my drivers per the custom skinny driver instructions. Is it possible that some required piece for NIS is not installed due to that?