Yes the reason why is the Windows has become worse and worse at networking with each new release.
In my case for some reason (likely the overly complex and opaque security system that keeps you out of your systems while allowing other in), the computer you are signed in on doesn't realize that it was the one that signed onto the network resources. So, after resetting the network cards, rebooting the server and other computers on the network including the one I was using to try and access the network, it turns out the solution is rather simple.
I simply booted the machine up. Logged in with my account and then explicitly logged out. When I logged back in I could access the network.
Now when I say this fixed the system I get about as much network connectivity as Windows 3.1. But at least I can access files on my server. Accessing this machine for other machines - well that is just asking too much from Windows 11.
Oh yeah, an using a Microsoft Account makes your machines super difficult for you to use but really easy for Microsoft to spy on you.