I've had several OneNote notebooks for years.
This morning, only the ones hosted on OneDrive failed synchronization.
Following other support tips for the initial error 0x80072EFD I re-started my Surface Pro, switched connections, and closed the notebook.
None of these had any effect, and I cannot sync the notebooks on other machines.
I also tried removing certificates as described here: http://social.technet.microsoft.com/Forums/office/en-US/29176a20-2e5c-421a-b314-cb8e5c7a150c/onenote-doesnt-recognize-internet-connection-unable-to-sync?forum=officeitpro
I can still open and edit the documents via OneDrive's web access, but I get the error in the title of this post if I try to open with OneNote.
How can I restore access to my notebooks and get them to sync?