Office 365 activate

Leslie C 20 Reputation points
2026-09-04T10:41:37.5566667+00:00

My current Office 365 subscription was working but no longer does, I have tried every suggestion from Microsoft help/support but nothing works, all I get even after re installing is Error 0x0. I am running a mac with Catalina OS with Version 10.15.8

Any help would be appreciated

Microsoft 365 and Office | Install, redeem, activate | For home | MacOS
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Answer accepted by question author
DaveM121 929K Reputation points Independent Advisor
2026-09-04T11:14:22.0133333+00:00

If your version of MacOS is Catalina (10.15.8), then the error you are seeing is caused by an update on the 13th of July, many people are seeing the exact same error (0x0) if you are unable to upgrade your MacOS to a newer compatible version, your Office apps will go into Read Only mode, on the link below they provide full details on that update.

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

If you are unable to upgrade your MacOS version to version 12 or higher, then the only option would be to use the free Office apps in a web browser.

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