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