If it is failing to join a session, it could be a couple things.
How are you hosting the session? As in, are you hosting and joining the game on the same computer with two windows? Or, are you running the game on two computers?
If it is failing to join a session, it could be a couple things.
How are you hosting the session? As in, are you hosting and joining the game on the same computer with two windows? Or, are you running the game on two computers?