DISCLAIMER: Potterworld or Droobledore LLC is not in any way affiliated with Mojang AB, J.K. Rowling, Warner Brothers or any company, copyright or trademark.
while freb is eloquent as always so ill add some detail
guiild chat breaks frequently and often, so you cant use it over worlds or classes. Usually it can be used in a house always, but this a bit silly honestly.
Thank you for bringing this issue up! Unfortunately, this is an ongoing issue that we do not have an easy fix for. However, we are aware that it exists and will keep an eye on it. We'll be elaborating on the issue in guilds in the future as well.