I use Onenote at work and home (I wanted to used it on my mobile too), but I'm experiencing some problems. The notebooks on other PCs don't combine the way they (possibly) should. Wen running a notebook from OneDrive, one that opens is the one from the PC it was created on. I'm slowly getting fed up with this "synchronization".
See if the problem recurs after creating a new notebook in the browser version of OneNote and logging in on any device. Out of curiosity, what version are yu using?
That windows and Office365 version. And I did what you suggested and no changes still.
Your problem may lay in using two different versions. Probably two different notebooks have been created. To be on the safe side, try naming one of them for example "Test" and then try to find it in other apps.
For real, turns out I created a couple of notebooks, including ones I worked on. Thans for your help.