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How to Troubleshoot Azure AD Connect Attribute Synchronization Problems
Question details
An email attribute from an on-premises Active Directory has stopped synchronizing and updating in the Microsoft Entra ID tenant.
- Product
- Azure AD Connect / Microsoft Entra ID
- Device & OS
- not provided
- Scenario
- Managing directory synchronization between an on-premises Active Directory and cloud-based Microsoft Entra ID environments.
- Observed behavior
- The email attribute previously synchronized successfully but has stopped updating the tenant address, despite the AD connector still being configured to export the attribute.
Ensure you have the necessary administrative privileges in both your on-premises Active Directory and Microsoft Entra ID portal. Temporarily pause any active manual sync scripts before investigating the Azure AD Connect synchronization rules.
Review Synchronization Rules and Attribute Mappings
Verify that the synchronization rules in Azure AD Connect are properly mapped and correctly exporting the on-premises email attribute to Microsoft Entra ID.
Attribute synchronization failures often occur due to conflicting synchronization rules, accidental filtering, or incorrect precedence settings after an update.
Log in to the server hosting Azure AD Connect and launch the Synchronization Rules Editor from the Start menu.
Review both inbound and outbound synchronization rules to ensure the specific email attribute is included in the mapping and has the correct precedence setting.
Verify that there are no filtering rules or scoping filters inadvertently excluding the target user object or the attribute from the synchronization scope.
Open the Synchronization Service Manager, navigate to the Operations tab, check recent export runs, and look for any attribute-level synchronization errors or staging issues.
Seek Specialist Assistance via Microsoft Q&A
If internal configuration checks do not resolve the issue, escalate the problem to Microsoft specialists for advanced troubleshooting.
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Frequently Asked Questions
Why is Azure AD Connect not syncing a specific attribute?
This usually happens due to incorrect synchronization rule precedence, attribute filtering configurations, or a schema update that misaligned the attribute mappings between the on-premises directory and Entra ID.
How do I force a synchronization cycle in Azure AD Connect?
You can force a sync cycle by opening PowerShell as an Administrator on your AD Connect server and running the command 'Start-ADSyncSyncCycle -PolicyType Delta' for a partial sync or '-PolicyType Initial' for a full synchronization.
Where can I view Azure AD Connect synchronization errors?
Sync errors can be viewed in the Microsoft Entra admin center under Azure AD Connect Health, or locally using the Synchronization Service Manager tool on your AD Connect server.
What is the Microsoft Entra ID tag used for in Microsoft Q&A?
The Microsoft Entra ID tag routes your question to specialized support engineers and community experts who are experienced in diagnosing complex identity, access, and directory synchronization issues.
