A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Both accounts ended in @gmail.com
Sharing works from second account to first account but not the other way around.
Tried exactly the same process on both accounts.
Tried the first account on multiple computers, OneNote Desktop, Mobile, Tablet and Online, same issue on all devices. Tried a third account on the same OneNote Desktop on one of the desktop computers, without any issues.