There does seem to be some issues related to credentials and other aspects of sharing with certain kb updates of Windows 11. I had an horrendous time with my newly acquired NUC 100, used with a DAS, when trying to connect to my main PC, also running Windows 11 24h2. No issues with Windows 10. Either refusal to connect, not finding the machine or credentials issues when it does see it. Then it will work for one direction of connection and sharing, not the other. RDP will work but not shares, security and other settings applied as appropriate.
Mine are somewhat sorted now, kinda hollow victory as I am not completely sure what of the many things I tried finally allowed access, and for that access to continue to work as needed.
There are a number of similar threads over at the Windows 11 forums concerning network shares and later more recent builds and updates to 24h2.
There are times that I dread Windows updates, home networking, for me anyway, is most fragile and often akin to being an alchemist in getting it to work.
Thank goodness, at times, for Macrium Reflect.
If I did not use Windows 11 for networking over the home, it would be fine.