You notice lots of different error messages in the logfile “
/var/log/univention-sysvol-sync.log” and the sysvol content does not get synced from the master to the school slaves.
The GPOs should be configured on the master and get replicated to all school-slaves.
Every school only applies the GPOs from sysvol which are available for their own OU=. You can only sync the GPOs if you install the Samba domain controller, even though you do noch have any Windows clients using the UCS master.
univention-app install univention-samba4
Afterwards the sysvol sync is running fine.