A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hi AJSchuster,
I'm sincerely provide you with instructions and help.
Actually, all the notebooks you using are stored in your OneDrive but not local drive, which means once your OneDrive is full, you aren't able to add new pages any more.
Under your situation, I have two suggestions for you.
1.Save your space in OneDrive and delete all unnecessary files.
2.Create a new Microsoft account that will have 5 GB free storage for OneDrive.
Hope my answer give you a bit assistance.
Regards,
Eric