Unable to play with 2 players on same network

We are just completely unable to get 2 people to play together on the same network.

When the host launches the campaign, it loads for the peer, but the host gets stuck at ‘Loading Game 4/4’ then does nothing until it switches to “waiting to join a match in progress” while the other players drop into the mission.

If we try to launch an arena/warzone match, it says unable to find a suitable server for all members of the fireteam.

  • I have tried both enabling/disabling uPNP
  • Port forward is enabled for both consoles, and they both have open NAT
  • One console isn’t fetching an IPv6 address for some reason
  • Each player can connect and play with people outside the network just fine, but lets say we have 2 people in the same network, and 2 people over the internet. It will only load in 1 of the 2 people on the same network.
  • Router is OPNSense, Modem is comcast modem in bridge mode.
  • Speed/ping are not an issue, nor is packet loss.