The colon notation used by the Emoji One implementation conflicts with some of the Teams emotes. Specifically, no emoji that start with "s", "p", "o", "x", or "d" can be added from Emoji One as :S, :P, :O, :X, and :D all automatically convert to Teams emotes. This significantly reduces the number of emoji that can be used with the Emoji One implementation.
Really annoying anti-feature... 😕
Pandu POLUAN commented
This should be easily fixable if emoji rendering is DEFERRED UNTIL SPACE IS PRESSED
So e.g., ":s" (colon s) won't become an emoji *yet*, but ":s " (colon s space) becomes the Teams emote.