The Emoji Menu shortcut (ALT+Q according to docs) doesn't work for replies. Once you select an emoji from the menu, it sends the emoji to the "Start a new conversation" input bar instead of the Reply input bar. This happens even if you click into the reply bar first and then click ALT+Q. Since Emoji's are mostly used in replies, this behavior makes little sense.
Thierry Dalon commented
there is a standard hotkey for emoji in windows 10 - for ENG it is Win+.
Michael J. Ryan commented
I'd love to see an emoji menu... for that matter, I'd like to see emoji substitutions for ::emoji:: for common ones... ex: ::thumbsup::
I was, frankly, surprised it wasn't already in the box.