Looks like this appeal slipped through the cracks, I'm sorry for the extremely long delay for a response. It's been many months since you were banned, we're willing to give you a second chance. Please understand that if you get permanently banned/muted there may not be another chance after this.
You are correct, you were muted after joining on another account after being muted. Just be aware that mute evasion is against the rules.
You now should be able to join and speak on the server. This appeal will stay open for a while, in case you have any questions or anything else to add.