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Subject: Microsoft 365 Family Activation Failure (Error 0x0) on macOS Big Sur
Dear Microsoft Support,
I am contacting you because I can no longer activate Microsoft Word on my Mac, despite having an active Microsoft 365 Family subscription.
My Microsoft 365 Family subscription is active and paid annually. I have verified on my Microsoft account that the subscription is active, and I am signing in with the correct Microsoft account that owns the subscription.
Microsoft Word worked perfectly until 13 July 2026.
On 14 July 2026, Word informed me that it needed to be updated. Since my Mac cannot officially be upgraded beyond macOS Big Sur, I could not install the newest version of Microsoft 365.
I therefore downloaded and installed Office for Mac version 16.77 (23091003) – Office Suite (without Teams), which is the last version that officially supports macOS Big Sur.
The installation completes successfully, and Word opens normally.
However, every time I try to activate Microsoft 365 by signing in, Word immediately displays the following error:
Unknown Error Error code: 0x0
The application cannot be activated.
I have already completed all of the troubleshooting steps recommended by Microsoft:
The problem started suddenly after Word requested an update on 14 July 2026.
Since everything worked until the day before, I suspect there may have been a recent change in Microsoft's activation service that affects Office 16.77 running on macOS Big Sur.
Could you please investigate whether this is a known issue?
If necessary, could you also reset or refresh the Office activation associated with my Microsoft account?
I would greatly appreciate your assistance, as my Microsoft 365 Family subscription is fully active, yet I am unable to use Word on my Mac.
Thank you very much for your time and support.
Kind regards,Subject: Microsoft 365 Family Activation Failure (Error 0x0) on macOS Big Sur
Dear Microsoft Support,
I am contacting you because I can no longer activate Microsoft Word on my Mac, despite having an active Microsoft 365 Family subscription.
My Microsoft 365 Family subscription is active and paid annually. I have verified on my Microsoft account that the subscription is active, and I am signing in with the correct Microsoft account that owns the subscription.
Microsoft Word worked perfectly until 13 July 2026.
On 14 July 2026, Word informed me that it needed to be updated. Since my Mac cannot officially be upgraded beyond macOS Big Sur, I could not install the newest version of Microsoft 365.
I therefore downloaded and installed Office for Mac version 16.77 (23091003) – Office Suite (without Teams), which is the last version that officially supports macOS Big Sur.
The installation completes successfully, and Word opens normally.
However, every time I try to activate Microsoft 365 by signing in, Word immediately displays the following error:
Unknown Error Error code: 0x0
The application cannot be activated.
I have already completed all of the troubleshooting steps recommended by Microsoft:
The problem started suddenly after Word requested an update on 14 July 2026.
Since everything worked until the day before, I suspect there may have been a recent change in Microsoft's activation service that affects Office 16.77 running on macOS Big Sur.
Could you please investigate whether this is a known issue?
If necessary, could you also reset or refresh the Office activation associated with my Microsoft account?
I would greatly appreciate your assistance, as my Microsoft 365 Family subscription is fully active, yet I am unable to use Word on my Mac.
Thank you very much for your time and support.
Kind regards,
En serie af Microsoft-softwareprodukter til tekstbehandling til oprettelse af web-, mail- og udskriftsdokumenter.
Dette forum er et bruger-til-bruger-forum. Microsoft annoncerede for nogen tid siden ændringer i Office-licenser. Hvis du ikke kan opdatere din version af macOS på den pågældende enhed, går Office-apps i skrivebeskyttet tilstand. De giver disse oplysninger på dette link.