Setting: UCS 5.0 latest update in AD Member mode. Installing Owncloud or Nextcloud on the system. If one tries to activate the App in the UMC or via the UDM, an error appears that the command tried to change the mail address. udm groups/group modify --dn "cn=Funlover,cn=users,dc=kevin,dc=demo,dc=univention,dc=de" --set owncloudEnabled=1 Value may not change: key=mailAddress old=None new=. The expected behavior would be a successful activation of the App Test systems: AD kkorte_kevin-membermode UCS kkorte-membermode
*** This bug has been marked as a duplicate of bug 56929 ***