Error "This page has been blocked as it violates the Acceptable Use Policy"

Symptoms

When users in your organization try to access a SharePoint or OneDrive in Microsoft 365 site, they receive the following error message:

This page has been blocked as it violates the Acceptable Use Policy located in the Terms of Use. If you believe this is a mistake, please contact our Support team using Microsoft 365 Admin Center for further assistance.

Cause

This issue occurs if any user in your organization engages in activities that are prohibited by the Acceptable Use Policy for Microsoft Online Services.

Resolution

If you believe that your organization isn't involved in prohibited activities, submit a support request to restore access. To submit a support request, select Contact support on the SharePoint Acceptable Use Policy page in the Microsoft 365 admin center.