ERROR MESSAGE

Francis 0 Reputation points
2026-09-15T16:40:15.7633333+00:00

I have paid for a subscription however everytime I try to sign into my Word I get an error message saying: "An unknown error has occurred. The error code is 0x0". How do I fix this?

Microsoft 365 and Office | Subscription, account, billing | For home | Windows

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  1. EmilyS726 267.8K Reputation points Independent Advisor
    2026-09-16T19:08:57.9566667+00:00

    Thank you for providing the macOS information.

    Microsoft 365 can run on macOS Ventura 13 only by using an older Office version.

    Microsoft ended support for Ventura with Office version 16.101, released in September 2025. Newer Microsoft 365 installations and updates require macOS Sonoma 14 or later.

    Uninstall your current Ms365, then downgrade to version 16.101 by using this installer. 

    https://officecdn.microsoft.com/pr/C1297A47-86C4-4C1F-97FA-950631F94777/MacAutoupdate/Microsoft_365_and_Office_16.101.25091314_Installer.pkg?apid=ets

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  2. AI answer

    2026-09-15T16:40:30.2866667+00:00

    This error is commonly caused by a Microsoft 365 subscription or payment issue.

    Try these steps in order:

    1. Close all Office apps Close Word and any other Office app completely.
    2. Check that the subscription is active Go to Services & subscriptions: https://account.microsoft.com/services Sign in with the Microsoft account that was used to buy Microsoft 365, then check the Microsoft 365 section.
      • If the subscription is expired, renew it.
      • After renewing, restart Word and test sign-in again.
    3. Check the payment method Go to Payment options: https://account.microsoft.com/billing/payments If the payment method shows an error, update it.
      • This is important if the card expired or a payment was declined.
      • After updating payment details, restart Word and try again.
    4. Make sure the correct account is being used Sign in with the same Microsoft account that is associated with the Microsoft 365 subscription.
    5. If Word shows a subscription notice and editing is blocked If the subscription issue is not resolved, Office can go into reduced functionality mode. In that state, documents can still be opened and printed, but editing and creating new files are blocked.
    6. Use Office on the web temporarily While resolving the subscription issue, Office on the web can be used at Office.com.

    If the message in Word is specifically “ACCOUNT NOTICE. We've run into a problem with your Microsoft 365 subscription and need your help to fix it.”, the supported fix is to verify the subscription status first, then update the payment information.


    References:

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