Before Information Rights Management can be used on any document, library, or list item, it must be enabled. To activate IRM, follow these steps:
- Navigate to the SharePoint Admin Center (https://admin.microsoft.com | Admin centers | SharePoint).
- Select Settings and select Classic settings page.
- Scroll to Information Rights Management (IRM), select Use the IRM service specified in your configuration, and then click the Refresh IRM Settings button:
- Scroll to the bottom of the page and click OK.
- Close the Classic settings page.
It may take up to an hour for the IRM settings to be available ...