GSSAPI Error: Miscellaneous failure (see text) (Matching credential) not found

Hello - I get this when running systemctl status univention-ad-connector
I seem to have difficulties with owncloud and nextcloud - the join scripts will not complete and exit with error code 1 – any help appreciated. I have a domaincontroller master on UCS 5.0. with AD connector to a windows 2016 domain. Haven’t been able to get it running correctly since upgrade. It doesnt appear samba4 is installed - should I install samba4 and s4 connector?