Compliance Problems

How to Resolve Microsoft 365 Sensitivity-Label Policy Simulation Failures

Chanuka Geekiyanage Sep 30, 2026 869 views

Question details

The user needs to fix a sensitivity-label policy simulation that identifies financial files but reports failed site scans, preventing the policy from being activated.

How to Resolve Microsoft 365 Sensitivity-Label Policy Simulation Failures

Product: Microsoft 365
Device & OS: not provided
Scenario: Running a sensitivity-label policy simulation to test and identify matching financial files before activating the policy across selected Microsoft 365 sites.
Observed behavior: The simulation successfully identifies matching files but reports that several sites failed to scan. Subsequently, attempting to activate the policy fails despite the files being located on the correct site.

Before you start

Ensure you have Microsoft 365 Global Administrator privileges, as you will need elevated administrative access to view compliance reports and open official service requests.

Solution 1Recommended

Open a Service Request with Microsoft 365 Support

Because simulation scan failures often stem from back-end server indexing or synchronization issues, opening a direct support ticket is the necessary resolution path.

Community moderators and front-line support cannot resolve backend compliance indexing failures. A specialized remote session is required to collect the necessary diagnostic logs directly from your tenant.

Access the Microsoft 365 Admin Center

Navigate to admin.microsoft.com and log in using an account with Global Administrator credentials.

Navigate to Support

Click on the 'Support' tab in the left-hand navigation menu, then select 'Help & support' to open the support assistant pane.

Describe the Issue

Enter details about the sensitivity-label policy simulation failure, specifically noting that sites failed to scan and activation is blocked despite matching financial files being present.

Create the Service Request

Bypass the automated suggestions by clicking 'Contact Support'. Fill out the required contact details and submit the ticket.

Prepare for a Remote Session

The back-end support team will contact you to initiate a remote session. Be prepared to authorize this access so they can safely collect diagnostic logs.

Alternative: Contact Your Reseller

If your Microsoft 365 subscription was purchased through a partner or reseller (CSP) and you lack permissions to create a direct support ticket, contact your provider and ask them to escalate the simulation issue on your behalf.

Open a Service Request with Microsoft 365 Support

Diagnostic Log Collection: Do not attempt to modify the sensitivity labels while waiting for support, as the current state and correlation IDs of the failed simulation runs are crucial for the back-end team to diagnose the root cause.

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Frequently Asked Questions

Why do sensitivity-label policy simulations fail on certain sites?

Simulations typically fail due to back-end indexing delays, temporary server synchronization issues, or permission mismatches on the specific SharePoint or OneDrive sites that the compliance center is attempting to scan.

Can I force a sensitivity-label policy to activate despite simulation errors?

No. Microsoft 365 intentionally blocks policy activation if the preliminary simulation encounters severe scanning failures. This safeguard prevents accidental broad impacts, false positives, or unintended data access restrictions across your organization.

What diagnostic logs does Microsoft need to fix label simulation failures?

Support teams usually require compliance center trace logs, the specific correlation IDs generated during the failed simulation runs, and backend SharePoint indexing logs. These are securely collected during an authorized remote diagnostic session.

Does restarting the policy simulation help resolve scan failures?

In cases of temporary server glitches, deleting the failed simulation and running a new one after 24 hours can occasionally resolve the issue. However, persistent failures always require Microsoft back-end support intervention.

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