Unable to Activate Microsoft 365 Subscription – Error Code 0x0

Question

Unable to Activate Microsoft 365 Subscription – Error Code 0x0

Thomas 0

Today, Microsoft Word and Excel started displaying the following message:

"Subscription required to edit and save. Start your free one-month trial of Microsoft 365 or sign in to activate an existing subscription."

I clicked Activate and tried to sign in with my existing Microsoft 365 subscription. After entering the verification code sent by Microsoft, I received the following error message:

"An unknown error has occurred. The error code is 0x0."

I have tried signing in multiple times, but I keep getting the same error.

I have already checked my Microsoft 365 subscription, and it is valid until August 20, 2026. I even purchased an additional one-year subscription to make sure the issue was not related to my account, but the problem still persists.

At the moment, I am unable to edit or save documents in Word and Excel, which is preventing me from doing my work. I would appreciate your assistance in resolving this issue as soon as possible.

laura mcewan 0 Reputation points

2026-07-18T13:29:20.37+00:00

my system is up to date and microsoft word still won't let me use it to type words. ive been trying to sort this out since yesterday morning. help me please.
Mel 0 Reputation points

2026-07-18T17:19:10.5866667+00:00

On a MacBook with Tahoe OS, I was having the same activation issue. I reinstalled from the subscriptions page (apparently I am using downloaded versions instead of web). After downloading the installer and re-installing the apps I wanted using the customize button, I launched Word again. I still had an activate button but the activation worked first time and I'm now able to use all the apps I downloaded.
diane 0 Reputation points

2026-07-18T22:55:40.7333333+00:00

I have the same issue and my MacBook is running Tahoe 26.5.2
Caroline Chilton-Bates 0 Reputation points

2026-07-28T15:53:33.06+00:00

I have the same problem on my Mac book air. Telling me I have to subscribe to edit/ save word docs and my subscription is fully uptown date - taken out of my a/c in April. Very frustrating as I am trying to do my invoicing!!!!!

3 answers

Your answer

laura mcewan 0 Reputation points

2026-07-18T13:29:20.37+00:00

my system is up to date and microsoft word still won't let me use it to type words. ive been trying to sort this out since yesterday morning. help me please.
Mel 0 Reputation points

2026-07-18T17:19:10.5866667+00:00

On a MacBook with Tahoe OS, I was having the same activation issue. I reinstalled from the subscriptions page (apparently I am using downloaded versions instead of web). After downloading the installer and re-installing the apps I wanted using the customize button, I launched Word again. I still had an activate button but the activation worked first time and I'm now able to use all the apps I downloaded.
diane 0 Reputation points

2026-07-18T22:55:40.7333333+00:00

I have the same issue and my MacBook is running Tahoe 26.5.2
Caroline Chilton-Bates 0 Reputation points

2026-07-28T15:53:33.06+00:00

I have the same problem on my Mac book air. Telling me I have to subscribe to edit/ save word docs and my subscription is fully uptown date - taken out of my a/c in April. Very frustrating as I am trying to do my invoicing!!!!!

Answer 1

SD - IA 177.6K Independent Advisor

Thank you, yes I just noticed Microsoft has also recommended that:

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

Update your OS

Prior to updating your Office apps, you need to ensure that you are running macOS 12 (Monterey) or later on your Mac, or iOS 17 or later on your iPad/iPhone. 

macOS: 

To update your Mac: 

Go to Apple menu > System Settings > General > Software Update.

Your reply will surely help others with the same issue. Have a great day!

Laura Cruger 0 Reputation points

2026-07-18T13:05:18.31+00:00

I am experiencing the same issue - cannot do my work. I hav no idea what version I have and/or how to remove it - and reinstall Microsoft. Are we to figure this out on our own - or will this issue miraculously cure??

Any help would be appreciated!!
Laura Cruger 0 Reputation points

2026-07-18T13:05:56.62+00:00

perhaps I should go to the Apple Store - maybe they could help - this live chatting and comment posting without the ability to talk to a "real" person is very frustrating!!

Answer 2

SD - IA 177.6K Independent Advisor

Hi,

Sincere apologies for the trouble you are having. I am seeing a lot of similar issues today, so something on the backend is causing this.

I'm going to run through a few steps with you. Some of these are diagnostic — they help me narrow down what's wrong, not fix it outright. So if nothing changes after a step, that's normal and expected, not a dead end. I'll keep going until we've got this resolved.

Is it MS office for Mac?
May I know the Mac version you are running?
Is it a Microsoft 365 subscription or an Office standalone?

I look forward to hearing from you to get the results of the troubleshooting.

Thomas 0 Reputation points

2026-07-14T08:36:20.8666667+00:00
Hi

I'd like to provide the following information:

Yes. It's for Mac

MacBook Air (M1, 2020), running macOS version 12.2.1.

It is Microsoft 365 subscription

Hopefully, the Microsoft team will identify the root cause of the issue and release a fix soon.

Thanks
Barbara Stowe 20 Reputation points

2026-07-14T16:11:16.55+00:00

Same problem! On my imac. I have MS office for Mac. I have a Microsoft 365 subscription. This is very disturbing indeed, I am in the middle of editing and can't edit anything!
Nicoletta Fumagalli 0 Reputation points

2026-07-28T15:10:05.2966667+00:00

I have the same issue. I'm running macos Big Sur.

Answer 3

SD - IA 177.6K Independent Advisor

Thank you. Microsoft supports 2 versions of MacOS, and Monterey is very old.

Could you please remove MS Office, use the 16.88 version from this link and see:

https://officecdn.microsoft.com/pr/C1297A47-86C4-4C1F-97FA-950631F94777/MacAutoupdate/Microsoft_365_and_Office_16.88.24081116_Installer.pkg

I wish I had an ideal answer for you, but in case If it does not help, I think you might be out of luck.

https://yourwindowsguide.com/2026/06/office-2019-for-mac-not-working.html

I look forward to hearing from you to get the results of the troubleshooting.

A Windows MVP writes content on the above website, so it is safe. However, do watch out for the ads. It should translate into your Browser language automatically.

Thomas 0 Reputation points

2026-07-14T11:54:18.0733333+00:00

Hi

Finally, I was able to fix the issue and use Microsoft 365 successfully by updating my macOS to macOS Tahoe 26.5.2. After that, I uninstalled the existing Microsoft 365 installation from my Mac.

Then, I downloaded the latest version of Microsoft 365 from Microsoft’s official website, reinstalled it on my Mac, and successfully signed in with my subscription.

(I tried downloading the Microsoft Office version from the link you provided and installing it, but the system reported an error and the installation was unsuccessful).

Thank you very much for your help and for sharing the information. I truly appreciate your support.
diane 0 Reputation points

2026-07-18T23:00:46.4166667+00:00

I am not running Monterey, I am running Tahoe 26.5.2 I have a subscription and it keeps giving me the error code 0x0.