A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Thank you for providing the information. If uninstalling and re-installing the OneNote app was done, it could have fixed the issue because doing the process, you'll have a fresh and updated copy of the app. The concern must be something else. At this point, I strongly recommend getting in touch with Office 365 support for extensive troubleshooting and real time support. You can click this link to reach them.
If you have other concerns, let us know.
Bob