Fix Active Directory Users Not Syncing to Microsoft 365 Global Address List
Question details
Newly created on-premises Active Directory users are failing to synchronize with Microsoft 365 distribution lists or appear in the Global Address List (GAL).
- Product
- Microsoft 365 / Active Directory
- Device & OS
- not provided
- Scenario
- Adding new users to on-premises Active Directory and syncing them to Microsoft 365.
- Observed behavior
- The newly created users do not show up in the Global Address List or Microsoft 365 distribution lists after the synchronization process.
Ensure you have administrative access to the Microsoft Entra admin center (formerly Azure AD) and your on-premises Active Directory server.
Verify Synchronization and Assign Exchange Online License
Check the Microsoft Entra admin center for sync errors and ensure the user has an active Exchange Online license to appear in the Global Address List.
For an on-premises Active Directory user to appear in the Microsoft 365 Global Address List (GAL), they must be successfully synchronized via Azure AD Connect and possess a valid mailbox. If they do not have an on-premises Exchange mailbox, an Exchange Online license must be assigned.
Log into the Microsoft Entra admin center and review the Azure AD Connect status section for any synchronization errors or blocked objects.
Search for the newly created user and target distribution lists within the Entra admin center to verify that they have successfully populated in the cloud directory.
Navigate to the Microsoft 365 admin center, go to 'Health' > 'Directory sync status', and ensure that directory synchronization is fully enabled and running on schedule.
If the user does not have an on-premises Exchange mailbox, go to 'Users' > 'Active users' in the Microsoft 365 admin center and assign an Exchange Online license. This provisions an online mailbox, allowing the user to appear in the Global Address List.
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Frequently Asked Questions
How long does Azure AD Connect take to sync new users?
By default, Azure AD Connect runs a delta synchronization cycle every 30 minutes. New on-premises Active Directory users should appear in Microsoft 365 shortly after the next cycle completes.
Why is a synced user not showing in the Global Address List?
The most common reasons are that the user does not have a mailbox (lacking an Exchange Online license) or the 'Hide from address lists' attribute (msExchHideFromAddressLists) is enabled in your on-premises Active Directory.
Can I force a directory sync manually?
Yes, you can force a manual synchronization by opening PowerShell as an administrator on the Azure AD Connect server and running the cmdlet: Start-ADSyncSyncCycle -PolicyType Delta.
