How to fix MAU issue help

Victoria 0 Reputation points
2026-09-16T10:04:07.56+00:00

I cannot activate Microsoft AutoUpdate, and am blocked for editing existing Word files. When I follow the instruction I get a pop up 'you can't open the application MAU because it may be damaged or incomplete. Please advise! thanks

Microsoft 365 and Office | Install, redeem, activate | For home | MacOS
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  1. AI answer

    2026-09-16T10:04:24.66+00:00

    On macOS, that MAU message usually means Microsoft AutoUpdate is missing, damaged, or has incorrect permissions. Since Word is also blocked for editing, use this order:

    1. Reinstall Microsoft AutoUpdate.
      • Download the latest AutoUpdate installer: Download
      • Run the downloaded installer package.
    2. If macOS is Ventura or later, make sure MAU is allowed to run in the background.
      • Open System Settings.
      • Go to General > Login Items & Extensions.
      • Under Allow in the Background, turn Microsoft AutoUpdate on.
      • If Microsoft AutoUpdate is missing there, reinstall it using the installer above.
    3. Update Office after MAU is repaired.
      • Close all Office apps.
      • Open Finder > Applications > Microsoft AutoUpdate.
      • Select Update All, or update individual Office apps.
      • If MAU is not visible in Applications, check /Library/Application Support/Microsoft/MAU2.0/.
    4. If Word still shows activation or editing is blocked, verify macOS version and update Office.
      • Ensure macOS is version 12 or higher.
      • If Office was installed from microsoft.com, update through Microsoft AutoUpdate.
      • If Office apps were installed from the Mac App Store, update them in the App Store under Updates.
    5. If MAU still cannot open or Word remains read-only after reinstalling MAU and updating Office, completely uninstall and reinstall Office.
      • This is the accepted workaround in similar Mac 0x0 / activation cases when updating does not resolve the issue.
      • Important: reinstall from the same source used to obtain Office. If obtained from Microsoft, reinstall from the Microsoft install flow. If obtained from the App Store, reinstall from the App Store.

    If the Mac is managed by an organization and software installation is blocked, contact the Helpdesk or IT administrator.

    References:

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  2. DaveM121 931.9K Reputation points Independent Advisor
    2026-09-16T10:38:17.6866667+00:00

    1

    Download the latest version of the Microsoft updater Tool from this link and try using that to update your Office apps.

    https://go.microsoft.com/fwlink/?linkid=830196

    2

    If that does not resolve the problem, there are some on-going issues with the Office apps on a Mac at the moment.

    A

    What version of Microsoft Office do you have, is that a subscription to Microsoft 365 or a standalone version of Office like Office 2019, 2021 or 2024.

    B

    At the top left of your Mac desktop, click the Apple icon and select 'About this Mac', what version of MacOS is installed on your computer?

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