It can be anything! An apex, subdomain, or even a URL.
Results forng.msg.teams.microsoft.com.mvision.yj-o365-and-onedrive.bt.myshn.eu
www.ng.msg.teams.microsoft.com.mvision.yj-o365-and-onedrive.bt.myshn.eumsg.teams.microsoft.com.mvision.yj-o365-and-onedrive.bt.myshn.euteams.microsoft.com.mvision.yj-o365-and-onedrive.bt.myshn.eumicrosoft.com.mvision.yj-o365-and-onedrive.bt.myshn.eucom.mvision.yj-o365-and-onedrive.bt.myshn.eumvision.yj-o365-and-onedrive.bt.myshn.euyj-o365-and-onedrive.bt.myshn.eubt.myshn.eumyshn.eueu