Use well-known names (short codes) for emoticons/emoji
Amongst others, Github and Slack use a common naming schema for emoji. Teams has a different naming schema for at least part of the emoji set, for example:
":ok_hand:" - not present in Teams
":disappointed:" - can't even be typed, as soon as ":d" is typed it becomes a Skype emoticon
Please use a common naming convention that a lot of people have already gotten used to.
Sam Walsh commented
Please add support for the emoji unicode standards https://unicode.org/emoji/charts/emoji-list.html
This is the set used in many other places: http://emoji-cheat-sheet.com