Hi Rob,
Thanks, that article helped. It's working now
1. Add to /etc/sssd/sssd.conf
[
domain/example.com]
ldap_user_extra_attrs=email:mail, sn:sn, givenname:givenname,
preferredLanguage:preferredLanguage
2. systemctl restart sssd.service
3. sudo sss_cache -E
Best regards, Bart