An error occurred while saving the commentMiles Duke commented
Pasting the content from OneNote to Word/Outlook seems like a fancier way to remove the formatting.
It isn't immediately clear that the formatting/structure from OneNote is gone, since it has been replaced by (too much) indentation and custom bullets.
I had some luck pasting into Confluence and then copying that to Teams (perhaps turning it into RTF along the way). Still the need for additional conversion deters me from using OneNote.