1. When the on-premises directory is synchronized with Microsoft 365, you must have a verified domain in Microsoft Entra ID. Only the user principal names (UPNs) that are associated with the on-premises Active Directory Domain Services (AD DS) domain are synchronized. However, any UPN that contains a non-routable domain, such as
`.local` (for example,
`[email protected]`), is synchronized to an
`.onmicrosoft.com` domain (for example,
`[email protected]`). For more information, see
[Prepare a nonroutable domain for directory synchronization
](/microsoft-365/enterprise/prepare-a-non-routable-domain-for-directory-synchronization?view=o365-worldwide&preserve-view=true).
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