The emoji's on the Discord Server were created by
ChrisL21 (Chris) https://www.iconarchive.com/artist/chrisl21.html The pack location is at: https://iconarchive.com/show/minecraft-icons-by-chrisl21.html
They are licensed for anyone to use anywhere so long as the author is properly credited, the icons are not modified or sold, and they aren't being used for commercial purposes.
CC Attribution-Noncommercial-No Derivate 4.0
Please enjoy the use of these server icons from a great artist.