Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi FireRain,
I’d like to clarify that there’s no standard domain in Office 365 besides Managed domain and Federated domain.
Managed domain is the normal domain in Office 365 online. And federated domain is used for Active Directory Federation Services (ADFS). Once a managed domain is converted to a federated domain, all the login page will be redirected to on-premises Active Directory to verify. This federation trust will make sure that the accounts in the on-premises Active Directory are trusted for use with the accounts in Office 365.
Thanks,
Brook