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How Azure AD Connect Password Synchronization Works with Microsoft 365
Question details
Understand how password hash synchronization operates when linking a new on-premises Active Directory domain to an existing Microsoft 365 tenant.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Connecting a new on-premises Active Directory domain to an existing Microsoft 365 tenant.
- Observed behavior
- Users need to know the directional flow of password synchronization and whether Microsoft 365 cloud passwords will download into the on-premises Active Directory.
Before configuring hybrid identity settings, ensure you have full administrative access to both your on-premises Active Directory and the Microsoft 365 tenant.
Understand the Password Hash Synchronization Flow
Learn the direction in which password hashes are synchronized between your on-premises environment and Microsoft Entra ID.
When deploying Azure AD Connect to link an on-premises Active Directory with Microsoft 365, it is crucial to understand the direction of data flow to prevent authentication issues.
In an Azure AD Connect setup, your on-premises Active Directory acts as the primary source of truth for user credentials.
Password hash synchronization pushes the password hashes from your on-premises Active Directory up to Microsoft Entra ID (formerly Azure AD). This allows users to sign in to Microsoft 365 using their on-premises passwords.
By default, this is a one-way synchronization. Enabling this feature does not download or write back Microsoft 365 cloud-only passwords into your on-premises Active Directory.
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Frequently Asked Questions
Does Azure AD Connect sync cloud passwords back to on-premises Active Directory?
No. Standard password hash synchronization is a one-way process that sends password hashes from the on-premises Active Directory to Microsoft Entra ID. It does not download cloud passwords to the local Active Directory.
What happens if a user changes their password directly in Microsoft 365?
Unless you have specifically configured and licensed 'Password Writeback' through Microsoft Entra ID Premium, a password changed directly in Microsoft 365 will not synchronize back to your on-premises Active Directory, which may lead to mismatched credentials.
Where can I get further assistance for my Azure AD hybrid setup?
For detailed configuration support or troubleshooting hybrid identity scenarios, it is recommended to reach out to the Microsoft Q&A community or open a support ticket through your Microsoft 365 admin center.
