Hi, hopefully you have this working now (sorry, just saw your post). I’ve been using this IIS/ARR setup for a couple of years now (over a Hyper-V HAOS instance) and it’s still working nicely. Mine is with Win 2022, but I’d be really surprised if that makes a difference.
If yours is still not working, let me know, I’ll send what I’ve got.
P.S. My setup is VERY similar to yours - including the specific IIS web site and the https redirect.