Multiseat steam LAN

[Rosie]

Hello, I'm having a hard time playing LAN games with the workstations I've set up. At the moment I'm attempting to play F1 2018 on steam with both workstations. I am running 2 instances of steam, with 2 accounts, each of them own f1 2018, and the games are running fine. I am able to host a LAN game, with either workstation, and I am also able to host an online game, but I get errors when attempting to join with the other workstation.

I have tried using DHCP for both workstations, as well as individual IP's for each. I currently am running both instances of steam in a sandboxie, and each game instance in their respective sandboxies. I have also tried only running 1 instance of f1 in sandboxie. No luck yet. Can anyone help me out?

Thanks