A Way Out Invite to friend not working [NEED HELP]

I'm having this issue right now I bought the game a couple days ago and sent him the "friend pass" and he downloaded the free version/demo and weve been trying all the network trouble shooting and nothing is working. Everytime he tries to join it just says '''authenticating" and loads for a while then a message appears saying "failed to join session" so I'm at a loss for what to do.