I had this happen in both of the past two machines I have built but both were installing windows 10 so I was ultimately able to just finish offline and then grab the drivers on a usb stick to get the internet up and running. The Intel NICs are notorious for not working without the intel drivers.

I still think Rufus is perfectly sufficient for avoiding these issues and/or using autounattend. Ultimately you just need to get past first install and nothing else will be an issue using a local account on Windows 11.