Error 0x0 or License not found on MacOS 11.7.11 (Office 2021)

Valentina Dmitrieva 20 Reputation points
2026-07-17T19:24:47.23+00:00

Hi! I have used my Office 2021 Home package, and as it seems to have happened with a lot of users, my Office has locked me out. I checked the info on this page, however my Mac is a bit old, and it can't be upgraded to MacOS 12. Is there still an option to get my license back? What can I do so that it sees my license?

Microsoft 365 and Office | Install, redeem, activate | For home | MacOS
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Answer accepted by question author
EmilyS726 267.9K Reputation points Independent Advisor
2026-07-17T19:58:51.1933333+00:00

If your OS is above version 12 but below 14, your office products can be functional, but Microsoft no longer maintains or updates that version. In this scenario, you can install the older downgraded version.

However, if it is below 12, it will now enter reduced functionality mode. In another word, the OS is too old to receive the licensing update the Office now requires. Sorry.

https://support.microsoft.com/office/update-microsoft-365-or-office-on-your-macos-or-ios-device-f418ae5d-bb5f-4078-b3d9-9340f5dd084e

I explained in greater details to this OP here as a lot of follow up questions were asked. In case you want some further reading:

https://learn.microsoft.com/en-us/answers/questions/5949459/office-home-business-2021-activation-product-key-r

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