Hi there and welcome
It appears the send to setting in onenote got changed, can you do the following please to correct this within onenote.
On the Tools menu, click Options.
In the Options dialog box, click Send to OneNote in the Category list.
Under Printouts, do one of the following:
To have files printed to a new page in a specific section of a specific notebook, click New page in section, and then browse to the notebook path and section file where the pages should be created.
To have files printed to a new page in the section that is currently open, click New page in the current section.
To have files printed to the page that is currently open, click On the current page.
Once set, it should now function correctly again
Let me know please how you go