Don't know if there is something and I just missed it. But I jumped in a test campaign just to try it out and invited a friend of mine to join as a player and test some things out. I had no idea he joined and didn't know he was in the game until he said something in chat.
With both of us at work, neither of us have video/mic, so the video/mic stuff popped up blank and I just kind of ignored it.
Just wondering if there could be some sort of Player Join notification and/or list of players who are currently connected to your campaign. I think it would be helpful, since not everyone is going to have Video/Mic and having the ability to spot check who's logged in would be helpful.