How to Safely Re-Enable Azure AD Connect Synchronization
Question details
The user needs to know the correct procedure to safely re-enable Azure AD Connect synchronization after migrating from on-premises Active Directory to Microsoft 365.
- Product
- Azure AD Connect
- Device & OS
- not provided
- Scenario
- Completing a move from an on-premises Active Directory environment to a Microsoft 365 cloud tenant and preparing to resume directory sync.
- Observed behavior
- The goal is to accurately map local AD objects to Microsoft 365 cloud objects, avoiding unexpected deletions, duplicate entries, or mailbox routing conflicts.
Ensure you have performed a full backup of both your on-premises Active Directory and your Microsoft 365 cloud environment before modifying synchronization configurations.
Validate Configuration and Enable Directory Synchronization
Follow these validation checks to ensure local and cloud objects map correctly before turning synchronization back on.
Re-enabling synchronization without verifying object states can cause Azure AD Connect to create duplicate user profiles or trigger unintended account deletions in the cloud. Careful validation ensures a seamless transition.
Verify that all users and groups destined for synchronization accurately map to the correct local Active Directory objects. Use SMTP, UPN matching (soft match), or SourceAnchor (hard match) to ensure cloud accounts link properly to on-premises accounts.
Open the Azure AD Connect wizard and review your filtering settings. Ensure that synchronized objects are restricted to the appropriate Organizational Units (OUs) to prevent syncing administrative or service accounts.
Check your Exchange Admin Center and local Exchange environment to confirm there are no duplicate on-premises and cloud mailboxes, which can cause severe email routing failures.
Temporarily remove any conflicting administrative rights or directory roles from accounts that could interfere with the directory synchronization process.
Once validation is complete and you have reviewed Microsoft's deployment guidelines, re-enable the sync schedule by opening PowerShell as an Administrator on the Azure AD Connect server and running the command: Set-ADSyncScheduler -SyncCycleEnabled $true.
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Frequently Asked Questions
What happens if I enable Azure AD Connect without properly matching local and cloud accounts?
If accounts are not accurately matched using UPNs or SourceAnchors beforehand, Azure AD Connect will likely fail to recognize the existing Microsoft 365 accounts and create duplicate cloud users instead.
How can I check the status of my Azure AD Connect synchronization?
You can check the synchronization status by opening the Synchronization Service Manager on your Azure AD Connect server, which displays a detailed history of recent sync cycles, successes, and errors.
Can I temporarily pause Azure AD Connect synchronization during a tenant migration?
Yes, you can easily pause synchronization to make necessary Active Directory changes by opening PowerShell and executing the command 'Set-ADSyncScheduler -SyncCycleEnabled $false'.
