It can be anything! An apex, subdomain, or even a URL.
Results for*.beta.officeapps.live.com.office.default.proxyaws.myshn.eu
www.*.beta.officeapps.live.com.office.default.proxyaws.myshn.eubeta.officeapps.live.com.office.default.proxyaws.myshn.euofficeapps.live.com.office.default.proxyaws.myshn.eulive.com.office.default.proxyaws.myshn.eucom.office.default.proxyaws.myshn.euoffice.default.proxyaws.myshn.eudefault.proxyaws.myshn.euproxyaws.myshn.eumyshn.eueu