Hi, I've just read in the Add-ons section of Veyon's web site:
"While the LDAP Basic plugin offers all functionalities required to integrate Veyon with LDAP/ActiveDirectory servers, it's however limited to a single server/domain and flat object hierarchies. The Veyon LDAP Pro add-on is able to fetch network objects from multiple servers/domains. Also location hierarchies in your LDAP directory (buildings, floors, rooms etc.) are represented 1:1 in Veyon Master. Especially central support teams for school districts love having all computers of all schools in one network tree."
Maybe that's the answer, change to LDAP Pro.