I've been messing with this for two days now. Running Windows 10 and the latest version of One Note. My problem is that my desktop version will not sync with the Ipad (air 2) version. If I open one drive on my ipad, the notebook isn't visible. I tried emailing myself an invitation to the notebook, but that opens up a folder with each individual section or page. I tried "moving" the notebook to Onedrive from the desktop program but that doesn't come up either.
So to try to simpliufy things can someone give me directions on how to do the following.
Make a notebook that is located on https://onedrive.online.com/etecetcetc available to onenote on my Ipad?

Hmm how do you open your books on your iPad? I have an iPad mini and when i installed the OneNote app it showed me that there were 30 notebooks that could be synched and if I wanted to do that. Do you use the same login for the windows live id?

You should be able to open your onenote blocks from your iPad.

Maurice