Office no longer working

For a 2020 Mac, the most likely causes in this scenario are an update/licensing issue or an Office installation problem.

Try these steps in order:

1. Update Office and macOS
   • Office on macOS should be on macOS 12 or higher.
   • Close all Office apps.
   • Open Finder > Applications > Microsoft AutoUpdate.
   • Install Update All.
   • Then open an Office app again and test.
   • If Office was installed from the App Store, open App Store > Updates and update the Microsoft apps there instead.
2. Check whether the subscription is active
   • Go to the Microsoft account Services & subscriptions page and sign in with the account associated with the subscription.
   • Confirm that Microsoft 365 is listed as active.
   • If the subscription is expired, renew it.
3. If Office shows an account notice or payment problem
   • Go to Payment options in the Microsoft account and check whether the payment method has an error.
   • Update the payment method if needed, then restart Word or another Office app.
4. If the apps are updated but still do not work
   • Create a new macOS user account from System Settings > Users & Groups.
   • Sign in to that new account and test Word or Excel.
   • If Office works there, the issue is likely with the Office setup in the original macOS account.
5. Reinstall Office for Mac
   • If the problem continues, uninstall Office for Mac and reinstall it from the Microsoft account Subscriptions/Services page.
   • If reinstalling, use the Microsoft account install source rather than the Mac App Store version when the license is tied to the Microsoft account.
6. If Office says the license is not found or shows Unknown Error 0x0
   • Updating Office through Microsoft AutoUpdate is the documented fix for that issue on macOS.

If the subscription was purchased through Apple/App Store, first verify the subscription under Apple subscriptions. If active, try restoring the previous purchase. If it still fails, contact Microsoft Support.

References:

• Unknown Error 0x0 or License not found error in Microsoft 365 or Office running on macOS | Microsoft Support
• Microsoft 365 subscription features aren't available in Office apps | Microsoft Support
• Office error "Account Notice: We've run into a problem with your Microsoft 365 subscription" | Microsoft Support
• Many of my Office features aren't working - Microsoft Q&A
• Office for Mac payment error code1007 | Microsoft Support