I get an error that Windows 10 version 1609 or later is required. I have Windows 11 20H2!
I had the same problem on the first beta and now the second and the same thing and Blizzard has done nothing to fix it even after they ask you to send them a bunch of stuff. I think that sucks Blizzard. $107.00 later and you can even play the dam game. If you ask for help they should help.
How did you install your Windows 11? Clean install or upgrade?