From 2017.8.1, All OneNote clients cannot sign in, or cannot create notebooks, or cannot create sections.
The issue I have is that I can't seem to create new notebooks on my Lenovo Yoga 300. I click on create notebook and fill in a name, but after I click create, it doesn't appear.
nickandre15 - OneNote Engineer - 2017.8.19
This is a known bug and we are feverishly trying to fix it. You can create a notebook online via OneNote.com while we struggle.