I often get messages from other players asking me to join them but I can't seem to make the connection. When I find the players character who issued the invite in my roster and try to select "join" I get a message telling me that acceptance is limited to friends only. I feel like an idiot as my avatar stands next to a group in the tower and I struggle to find the proper procedure which will allow me to accept their leaders invitation to join them. I'm on xbox 1.