An unknown error has occurred. The error code is: 0x0

Parham Gohari 0 Reputation points
2026-09-14T10:36:48.2733333+00:00

I cant sign onto any MS 365 products . I get error message with code 0x0

Microsoft 365 and Office | Other
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  1. AI answer

    2026-09-14T10:37:02.8633333+00:00

    For the Microsoft 365 for Mac 0x0 activation error, the supported fix is to update Office and confirm macOS is at least version 12.

    1. Check that macOS is version 12 or later.
    2. Close all Office apps.
    3. 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/.
      • Select Update All, or update each Office app individually.
    4. If the apps were installed from the Mac App Store:
      • Open App Store.
      • Select Updates in the sidebar.
      • Update Word, Excel, PowerPoint, Outlook, and OneNote.
    5. After updates finish, open an Office app again and test sign-in.

    If Office was installed from one source but updated or reinstalled from another source, use the install source that matches the purchase source:

    • App Store purchase/subscription: install from the App Store.
    • Microsoft purchase/subscription: install from the Microsoft 365 install experience.

    If Microsoft AutoUpdate shows update failures, uninstalling and reinstalling from the correct source is a documented path used in similar cases.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. DaveM121 931.2K Reputation points Independent Advisor
    2026-09-14T11:08:58.1766667+00:00

    The 0x0 error is a widely reported problem with the Office apps on an Apple Mac device at the moment.

    1

    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.

    2

    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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