iCloud for Windows and Log in With Apple Authentication Error Solution (Intel Killer Network Card)
For many months I've been trying to fix iCloud for Windows and Log in with apple on my Windows Laptop, turns out the solution is way easier than most people are saying around the internet. As it seems to be caused by an Killer app/driver update.
What you need to do is verify if you computer has a Intel Killer Network Card, if it does you'll need to enter into windows services and disable any services that has "Killer Network" on its name, after that enter into properties of those services and turn off auto start for them. After all that just head into your control panel/settings and completely uninstall the Killer Control Center.
For those that do not have a Killer adapter, a temporary fix is to go into your network adapter settings and disable the Internet Protocol Version 6 (IPv6) or just try and do the equivalent steps I did with your network card equivalent.
Windows, Windows 11 (26100)