My friend and I are currently trying to play together. We are both on and in a group but we don't show up on eachothers map and we can't hear eachother.
Sometimes it works, sometimes it doesn't.
It is what it is.
The way mic chats worked on DC Universe Online was that you had to turn on the mic before entering the game. Not sure if it'll work or not but give it a try.
Checked on the official forums and people arehaving the same issue amongst other mic related issues. They are working on it as we speak. Seems it's a crapshoot at this point and can lose mic audio at any time.
Another time where being a mutli console owner benefits me. My friend and I will just use xbox live headsets to chat until they fix this.
"If you can eat your food while everyone else is losing theirs and blaming you, you straight, homie." -Big Smoke