A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
This is definitely a new problem. Previous versions of OneNote allowed you to open an existing notebook. The most recent versions don't. It's a little mystifying since this is a fairly obvious flaw. You can create new notebooks, but if you move to a new device, you can't open the notebooks you've created.
Please fix ASAP, as currently this previously great tool is useless.
To anyone affected, there is a workaround. If you open the web version of OneNote and open a notebook, it will open it in the OneNote app, at which point it will persist.