An Azure service that is used to control and help secure email, documents, and sensitive data that are shared outside the company.
Seems to be backend issue but check below too:
- Verify that the Microsoft Purview sensitivity labeling service is accessible and functioning normally.
Confirm the user can retrieve label policies from Microsoft 365.
Check for recent changes to sensitivity labels, publishing policies, or licensing.
Ensure Office is signed in with the correct account and update Office to the latest version.
Review client logs using Microsoft Information Protection Diagnostics and Office telemetry logs for detailed error information.