It can be anything! An apex, subdomain, or even a URL.
Results for*.portal.office.com.demo.office365.tgstaff.myshn.eu
www.*.portal.office.com.demo.office365.tgstaff.myshn.euportal.office.com.demo.office365.tgstaff.myshn.euoffice.com.demo.office365.tgstaff.myshn.eucom.demo.office365.tgstaff.myshn.eudemo.office365.tgstaff.myshn.euoffice365.tgstaff.myshn.eutgstaff.myshn.eumyshn.eueu