It is Win 2019 Essentials with AD 2008R2 function level
Edit: In this thread
there is a picture
https://community.nethserver.org/uploads/db8506/original/2X/6/67d4982d8a42e57c5f7c679afc15655494854f8f.jpg
from LDAP config where you can see you can choose between LDAP and AD. In my GUI i cannot choose anything at all.
