Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
For this Mac scenario, the most relevant cause is the known Unknown Error 0x0 / License not found issue in Office on macOS.
Use this path:
- Check macOS version Office activation on Mac requires macOS 12 or later in the documented fix path.
- Update Office first
If Office was installed from microsoft.com:
- Close all Office apps.
- Open Finder > Applications > Microsoft AutoUpdate.
- If needed, check /Library/Application Support/Microsoft/MAU2.0/.
- Install updates with Update All or update each app individually.
- Reopen Word and test sign-in/editing.
- If Office came from the App Store
- Close all Office apps.
- Open App Store > Updates.
- Update Word and the other Microsoft apps.
- Reopen Word and test again.
- If Word still shows 0x0 and stays view-only after updating A documented accepted resolution for this Mac issue is to completely uninstall Office for Mac, then reinstall it. This is especially relevant when sign-out/sign-in and credential cleanup have already been tried.
- If Word opens but crashes or behaves abnormally
Reset Word preferences and the Normal template:
- Quit all programs.
- Go to Home > Library > Preferences.
- Move com.microsoft.Word.plist to the desktop.
- Open the Microsoft folder in Preferences and move com.microsoft.Word.prefs.plist to the desktop.
- Start Word and test.
- If the issue remains, restore those files, then go to Application Support > Microsoft > Office > User Templates and move Normal.dotm to the desktop, then test again.
Important: Resetting Word preferences removes custom preferences such as keyboard shortcuts, toolbar changes, or dictionaries.
If the issue is specifically the current 0x0 licensing problem on macOS, updating Office is the first documented fix path. If that does not resolve it, uninstalling and reinstalling Office is the matched next step from the provided Mac cases.
References:
- Unknown Error 0x0 or License not found error in Microsoft 365 or Office running on macOS
- Currently unable to edit microsoft word or excel, despite having annual Microsoft 365 subscription - Microsoft Q&A
- Error code 0x0 appears on word documents - Microsoft Q&A
- Word for Mac error: "Microsoft Word has encountered a problem and needs to close"