As of sometime today I can no longer synch notebooks hosted on onedrive.live.com. They all worked fine yesterday. They still work via web interface version of OneNote. Also my work notebooks hosted on sharepoint.com are still working. Here is a screenshot:
The OneNote 2016 is build 8326.2070 and OneNote app is 17.8366.57611.0. Windows 10 is 1703 - 15063.540. It may be a windows problem more than OneNote / OneDrive issue since cumulative update was recently applied.