You need to join the Garry's Mod server to unlock full access to the Discord. If you joined for the Discord chat tag, you do not need to do anything beyond joining the server which you have already done. Next go to your Discord profile settings and enable the tag there.
If you are trying to join the garrys mod server u can join via the Multiplayer menu or Going to the Console and typing "connect 193.243.190.39:27015" ( 193.243.190.39:27015 is the IP for the garrys mod server )
It almost like the moderators have no requirement to actually take sits. The result being 40 min wait for 1 ticket, not getting it answered before it disappears, or it resulting in a punishment not befitting of their actions. Who could've guessed that not enforcing the job that someone signed up to do would have negative consequences?!!?!?!???!?