Yay, success!
now you know how to do it going forward.
As for this specific issue, I had already answered you in your channel. The problem was that your alias is sending the string to the $2 parameter, and you're always calling it with the $2 parameter being the $chan that they joined. If you called the alias using the literal #AKA instead of using $chan, the display would go there instead of the channel they're joining.
