I searched around for a fix to this issue and here is what I found:
"Please open the OneNote client >FILE>Account>Add a serviceto add personal OneDrive or SharePoint Online location. You can also clickswitch accountto add other accounts.
When we use different accounts, OneNote notebooks are created and managed in the different places. With the Microsoft account, the personal OneNote notebooks are stored in the personal OneDrive. With the Office 365 Work or School account, the OneNote notebooks are created and stored in the OneDrive for business. Thus, we can only separately manage the personal notebooks and company notebooks in cloud.
However, in the OneNote client, we are able to add multiple accounts and services so that we can flexibly switch between the personal notebooks and the company notebooks."