D4 not in library, purchased on Steam…

I purchased Diablo IV on Steam months ago. Played a fair amount. Went to recently play, and the game will neither launch from Steam (gives error about OS that makes no sense), or Battle.net. Battle.net actually doesn’t show the game in my library. It shows I’ve purchased it, shows I have game time, but I cannot get it to let me launch.

I have uninstalled BNet, Diablo from Steam, then reinstalled, still don’t see it in BNet.

Last time I played it was launching directly from Steam, but now it gives me some bogus error about Windows 10 1909, I have Windows 11 24 (23?) H2.

I’ve been at this for days. I need help.

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