Fix AAD to SharePoint Sync Deleting Sites and OneDrive Notices
Question details
SharePoint sites are being incorrectly deleted and restored, causing automated OneDrive preservation emails to be sent to users.
- Product
- Microsoft SharePoint / Entra ID
- Device & OS
- not provided
- Scenario
- Administrators notice sites disappearing and users receiving deletion alerts, with audit logs pointing to directory synchronization actions.
- Observed behavior
- Audit records indicate that 'AAD to SharePoint Sync' is the actor responsible for deleting the SharePoint sites and triggering the OneDrive notices.
Ensure you have Global Administrator or SharePoint Administrator privileges in Microsoft 365, and avoid making immediate directory changes until you have backed up your current audit logs.
Review Entra ID and Purview Audit Logs
Investigate the root cause by checking for synchronization errors, deleted accounts, or license modifications in Microsoft Entra ID and Purview.
The AAD to SharePoint Sync process ensures that user identities and licenses match across your tenant. If it erroneously deletes sites, it is typically due to a misconfiguration, accidental group removal, or bulk license changes.
Log in to the Microsoft Purview compliance portal using your administrator credentials and navigate to the Audit section.
Run an audit log search focusing on the affected SharePoint sites and check for recently deleted users or groups within the specific timeframe.
Open the Microsoft Entra admin center and review recent identity synchronization configuration changes to verify that source accounts or groups were not accidentally removed.
Check for any bulk license changes or expirations in the billing section that might have triggered the automated OneDrive preservation emails.
Escalate to Microsoft Support for Diagnostics
If the source of the synchronization issue cannot be identified locally, open a support ticket to request backend diagnostic assistance.
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Frequently Asked Questions
Why do users receive OneDrive preservation emails during this sync issue?
When the AAD to SharePoint sync process incorrectly flags a user account or site as deleted (due to a sync error or missing license), Microsoft 365 automatically sends a preservation email to alert the user or manager that the associated OneDrive data is queued for deletion.
What exactly is AAD to SharePoint Sync?
It is a backend Microsoft 365 synchronization process that ensures user identities, group memberships, and licenses managed in Microsoft Entra ID (formerly Azure AD) are accurately reflected and provisioned in SharePoint Online and OneDrive.
How long do I have to restore a deleted SharePoint site?
By default, deleted SharePoint sites are retained in the SharePoint admin center's recycle bin for 93 days. During this window, an administrator can fully restore the site and its contents.
Can simple license changes trigger site deletions?
Yes. If an identity synchronization error removes a user's Microsoft 365 license or deletes their cloud identity, their personal SharePoint sites and OneDrive accounts will lose their active status and eventually be queued for deletion.
