Microsoft has removed the 'BypassNRO.cmd' script from Windows 11 preview builds, which allowed users to bypass the requirement to use a Microsoft Account when installing the operating system.
"This change ensures that all users exit setup with internet connectivity and a Microsoft Account."
@pcyx If you install from an ISO, you apparently can still install with a local account when creating an unattend.xml
This site lets you create a customized XML file: https://schneegans.de/windows/unattend-generator/