It can be anything! An apex, subdomain, or even a URL.
Results forwindows.microsoft.com.prod.o365proxy.firstabudhabibank.myshn.eu
www.windows.microsoft.com.prod.o365proxy.firstabudhabibank.myshn.eumicrosoft.com.prod.o365proxy.firstabudhabibank.myshn.eucom.prod.o365proxy.firstabudhabibank.myshn.euprod.o365proxy.firstabudhabibank.myshn.euo365proxy.firstabudhabibank.myshn.eufirstabudhabibank.myshn.eumyshn.eueu