In the latest Windows 11 preview build, Microsoft removed the “bypassnro” command, which let users skip signing into a Microsoft Account when installing Windows.
i assume you didn't install today's beta release a month ago 😉
EDIT: nevermind, i re-read your comment... it's mandatory in some regions, I know for sure it's mandatory in the US and in Hungary (EU).
One other thing is that if you created the installer with Rufus, that adds some magic optionally that can bypass it. I wonder if that still works with this beta.