I recently noticed that you can no longer create handwritten emails on the Win 10 version of the OneNote App. When you go to share the note via email, it doesn’t display the image. I tested it on 3 different devices with the same result. Very disappointing. This does however still work on OneNote Desktop but, of course, you have to use Outlook as your email to get it to work.
That is disappointing. You can highlight the area of the OneNote document that you want to send and do a Copy and Paste to the Email. I always had trouble doing this on Windows 8.1, the clipboard always appeared to be empty when I tried.