It can be anything! An apex, subdomain, or even a URL.
Results formspim.ext.azure.com.office.rp.skydemo.myshn.eu
www.mspim.ext.azure.com.office.rp.skydemo.myshn.euext.azure.com.office.rp.skydemo.myshn.euazure.com.office.rp.skydemo.myshn.eucom.office.rp.skydemo.myshn.euoffice.rp.skydemo.myshn.eurp.skydemo.myshn.euskydemo.myshn.eumyshn.eueu