OneNote for Mac v16.66.1 with Catalina OS X 10.15.7 will not sync

Hello,

Welcome to the Microsoft Community Forum. Please accept our warmest regards and sincerest hope that all is well despite the situation you find yourself in.

I'm sorry to hear about the syncing issue you're experiencing with OneNote on your Mac. To troubleshoot this issue, please try the following steps:

1. Make sure you have a stable internet connection.
2. Sign out of your Microsoft account in OneNote and sign back in.
3. Check for updates for both OneNote and your macOS.
4. Try closing and reopening OneNote.
5. If the issue persists, you may need to recreate the affected section.
6. It would be better if you will upgrade the operating system of your Mac maybe up until Ventura, Sonoma or Sequoia. The reason for this is the operating system of your Mac maybe not compatible with the latest version of Office application that you have.

Hope this helps.

Best Regards,

Fordy B.

Microsoft Community Moderator

Thanks for your reply. I've tried all the standard fixes; unfortunately I am unable to update my MacOS because Apple decided to discontinue support for my iMac at Catalina (10.15.7) -- It's one of the few complaints I have against Apple. This issue of OneNote suddenly being unable to sync and displaying "We couldn't open this section" is being reported more commonly on various sites (e.g. Reddit) -- It appears very much a Catalina compatibility issue. Note: I can access my OneNote document without any issue on my other newer Mac devices. I'm hopeful that if this issue is reported by more persons that Microsoft would be willing to investigate what changed recently with OneNote and restore compatibility with Catalina.

Thanks again for your prompt reply.

-dean

We are happy to hear that the problem you had has been resolved. We’re glad we were able to help you!

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Thanks again for choosing Microsoft!

Regards,

Fordy B.

Microsoft Moderator

i have the same issue - is there a fix please ?

I have the same issue, tried all the ways and steps above mentioned, but not fixed. Please if there any possible solution?