Have 2 PC on the same network. Windows 10 and Windows 11. Both playing terraria on steam on separate accounts. Trying to join a classic vanilla game via steam attempting to use the join game via steam and through invite function in game. No password, friends allowed and friends is friends allowed. We play other games together such as 7dtd and civ 6 on steam. When we try to play together the only error we get is connection lost immediately upon trying to join. Have tried to join each other's games on both PCs. Both versions are up to date and current and both PCs have allowance made for Windows firewall.