Hi,
I appreciate you for posting your concern in the Community Forum. Let's try to solve this error message. Were you able to perform all troubleshooting steps provided in the articles below? If not
yet, please do so and get back to us with the results.
Fix issues when you can't sync OneNote
Fix sync issues in OneNote for iOS or Android
Seeing that you are an Office 365 subscriber, therefore, we also encourage you to take advantage of free
Technical Support that is one of the benefits of this program. We have folks there that are more than just equipped in doing more advanced methods of troubleshooting to solve this matter in real-time. Here's the link where
you can reach them.
For any results, please let us know by replying to this thread, and we will get back to you as soon as we can.