Eden utilise witches.town. Vous pouvez læ suivre et interagir si vous possédez un compte quelque part dans le "fediverse".
So I tried to login to mixer, and they revealed the regex they're using for username validation, which is kinda bizarre.
""username" with value "Eden (they)" fails to match the required pattern: /^[\w_-]*[A-Za-z][\w_-]*$/i"