It can be anything! An apex, subdomain, or even a URL.
Results forsecretsync.eop-gls08.gallatin.protection.partner.outlook.cn
www.secretsync.eop-gls08.gallatin.protection.partner.outlook.cneop-gls08.gallatin.protection.partner.outlook.cngallatin.protection.partner.outlook.cnprotection.partner.outlook.cnpartner.outlook.cnoutlook.cncn