I can do it too (I'm on 26200.9278), but I prefer to stay on stable (public) version of Windows 11. 26H2 is RP. I don't trust on it.
If WU will suggest it to me, it's anoter story.
The problem solved with the Store :
net user administrator /active:yes and change it there in store.
and then net user administrator /active:no to remove admin user.