Making a discord to talk to YOU is fine. Very cool.
Making a discord to invite public to speak to the Council, calling it the Seat of the Council, was an issue. This was the original post in your discord advertisement posted on the CC forum before you edited it.
The server is intended to bring everyone together who shares a passion for World of Warcraft, and wish to engage with the Council in real-time. There is always a risk that a Council member may suggest something that a significant portion of the fanbase disagrees with, or that a community feels like they’re not being represented in the Council, and I believe that being able to talk about the game and being able to connect with Council members directly will greatly increase the effectiveness of the program.
It was later changed to something like “council members who choose to join”.
The push back you got was that you did not talk to anyone on the Council about wanting to do that. You did not talk to Blizz about it and despite saying it is unofficial, calling it the Seat of the Council still gives that impression that it is somehow connected to the program.
The other push back you got from Council members was that being public and un-moderated would likely end badly because there are some pretty unsavory sorts on the internet. It would either result in harassment or it would reflect badly on the council by letting those unsavory sorts hang out.
This was all avoidable. All you had to do was post on GD asking who wants to talk to YOU and keep the Council side out of it. So yeah, that was the mistake, you used the Council forum to advertise, involved CC folks without asking, and had limited or no moderation.