It really comes down to where and how you would share the Discord server. We do not permit advertisement threads for external sites or organizations. That means posting on the public boards trying to recruit people to join your server is out of the question. The same goes for sending people recruitment PTs for said Discord server. On the other hand, you are more than welcome to put up a link in your profile and/or signature though. Signatures and profiles are the only way that we permit people to advertise external sites and organizations.
~Proud Nintendo Fan~
Animal Crossing--The Good Life