Microsoft 365 users hit by random product deactivation errors

Microsoft is investigating a widespread Microsoft 365 issue that displays 'Product Deactivated' errors in Office apps due to admin-driven licensing changes (e.g., moving users between licensing groups, switching subscriptions, or toggling service plans). Users are advised to reactivate via the banner or sign out/in of apps, while admins should verify subscription status; Microsoft requests diagnostic data for open cases and is working on a fix.