It can be anything! An apex, subdomain, or even a URL.
Results for*.beta.officeapps.live.com.mvision.yj-o365-and-onedrive.bt.myshn.eu
www.*.beta.officeapps.live.com.mvision.yj-o365-and-onedrive.bt.myshn.eubeta.officeapps.live.com.mvision.yj-o365-and-onedrive.bt.myshn.euofficeapps.live.com.mvision.yj-o365-and-onedrive.bt.myshn.eulive.com.mvision.yj-o365-and-onedrive.bt.myshn.eucom.mvision.yj-o365-and-onedrive.bt.myshn.eumvision.yj-o365-and-onedrive.bt.myshn.euyj-o365-and-onedrive.bt.myshn.eubt.myshn.eumyshn.eueu