Microsoft Office on the Mac-

For error 0x0 on Office for Mac, the supported fix is to update both macOS and Office. Reinstalling alone does not resolve this issue.

1. Verify macOS version
   • Make sure the Mac is running macOS 12 or later.
   • If the Mac is below macOS 12, update macOS first.
2. Close all Office apps
   • Quit Word, Excel, Outlook, PowerPoint, and OneNote completely.
3. Update Office from the correct source
   • If Office was installed from microsoft.com, open: Finder > Applications > Microsoft AutoUpdate
   • If Microsoft AutoUpdate is not visible, check: /Library/Application Support/Microsoft/MAU2.0/
   • Install all available updates by selecting Update All.
4. If Office was installed from the Mac App Store
   • Open App Store > Updates
   • Update each Microsoft app, or select Update All.
5. Restart and test activation again
   • After updates complete, reopen Word or Excel and sign in with the account that has the Microsoft 365 Business Standard license.
6. If activation still fails
   • Sign out of Office and sign back in with the licensed work account.
   • If multiple licenses or an older Office license was previously used on this Mac, remove the old Office license files and reactivate. Microsoft provides the steps here: Remove Office license files on a Mac.
7. If Office still cannot activate after updating
   • Reset Office credentials in Keychain Access:
     • Open Spotlight
     • Search for Keychain
     • Search for Office
     • Delete the Office data license file
   • Then run the Microsoft 365 Activation troubleshooter and try activation again.

Important checks for this scenario:

• License verification: confirm the sign-in account is the same account assigned the Microsoft 365 Business Standard subscription.
• Compatibility: Office on Mac must be updated, and the Mac must be on a supported macOS version.
• Installation source matters: if the apps originally came from the App Store, update there; if installed from Microsoft, use Microsoft AutoUpdate.

If the Mac is already on macOS 12 or later and Office is fully updated, this specific 0x0 / License not found issue is documented as resolved through Office updates.

• Unknown Error 0x0 or License not found error in Microsoft 365 or Office running on macOS | Microsoft Support
• Update Microsoft 365 or Office on your macOS or iOS device | Microsoft Support
• What to try if you can't install or activate Office for Mac | Microsoft Support