It can be anything! An apex, subdomain, or even a URL.
Results for*.config.skype.com.portal.o365proxy.mvcpoc.myshn.eu
www.*.config.skype.com.portal.o365proxy.mvcpoc.myshn.euconfig.skype.com.portal.o365proxy.mvcpoc.myshn.euskype.com.portal.o365proxy.mvcpoc.myshn.eucom.portal.o365proxy.mvcpoc.myshn.euportal.o365proxy.mvcpoc.myshn.euo365proxy.mvcpoc.myshn.eumvcpoc.myshn.eumyshn.eueu