It can be anything! An apex, subdomain, or even a URL.
Results for*.login.microsoftonline.com.office.prod.fcc.myshn.eu
www.*.login.microsoftonline.com.office.prod.fcc.myshn.eulogin.microsoftonline.com.office.prod.fcc.myshn.eumicrosoftonline.com.office.prod.fcc.myshn.eucom.office.prod.fcc.myshn.euoffice.prod.fcc.myshn.euprod.fcc.myshn.eufcc.myshn.eumyshn.eueu