AD Connector with limitations

We would like to use AD Connector (UCS 5.0.4) with UCS that has been joined to the Windows Server 2019 AD DS domain. Users and groups are synchronized but only the given name and the name are visible into the OpenLDAP of UCS, all fields as mail, mail aliases, proxymailaddresses, street, postalcode, l, company, department, telephonenumber are empty, although they are listed with a univention-ldapsearch (sometimes with the email encrypted?).
The bad result is that they are not avalaible thru external connections to UCS ldap (into GLPI for example).
Is it possible to make these fields visible and if yes how?
Thanks by advance for any help.