Unknown Error code 0x0.

Question

I have a valid subscription but can't activate

I have Microsoft 365 on my MacBook pro. My spreadsheets won't save unless I hit the Activate button, but when I do, I get an error message "Unknown Error code 0x0.

Answer 1

Hello

Do you have the latest macOS Tahoe version? If so, please make sure you are on version 26.6.2.

If you are and it still doesn't work,

First, see if you can update your Office apps. Open Word for example, click on the 'Help' tab >Check for Updates. Make sure you choose Update All when prompted. Let the process run through, can take a bit time. See if that works.

Otherwise, use the Update method in this article: https://support.microsoft.com/support/known-issues/unknown-error-0x0-license-not-found-error-microsoft365-macos?apid=ets

If it still doesn't work, please uninstall the apps. Follow the instructions here for complete uninstall.

https://support.microsoft.com/office/office-for-mac/troubleshoot-office-for-mac-issues-by-completely-uninstalling-before-you-reinstall?apid=ets

Then reinstall this way:

If you signed up via Apple App Store, then download and install from the App Store.

If you signed up via Microsoft directly, please go to https://www.office.com

Sign into the Microsoft account you used for the subscription. Click on the 9-dot icon on the upper left > More apps.

Then on the upper right, click on "Install apps". This will now download the installer file. Once downloaded, click on the file to install. It will install the Desktop version of the apps for you then.

https://support.microsoft.com/office/download-install-or-reinstall-microsoft-365-or-office-2024-on-a-pc-or-mac-4414eaaf-0478-48be-9c42-23adc4716658?apid=ets

If it still doesn't work, download the updater https://support.microsoft.com/office/office-for-mac/troubleshoot-microsoft-autoupdate-in-microsoft-365-and-office-for-mac?apid=ets

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If you are not using Tahoe, please specify which version you have for your macOS, as the instructions can be different.