A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hi Brian,
In line with the message that you’re encountering when accessing a page of your OneNote notebook, I’d recommend checking this article and you may perform the steps that you haven’t done yet. It may fix the issue when you can't sync OneNote.
Following the methods from the article should be able to address this concern. However, if the issue still persists, you may take advantage of the benefits and features of your Office 365 subscription by reaching out with our Office Support through this link. They can provide immediate assistance and do remote access for further troubleshooting.
Please respond to this thread to let me know how the issue progresses. Similarly, if you have more questions, please inform me by replying to this post.