Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - Bugs & Technical Problems DOS2 Switch Multiplayer - Third Player Can Never Join

When I try to invite two players to join my DOS2 game (all on Switch), the third player is never able to join. The error they see is usually 2618-0513.

Either of the two other players are able to join my game as long as they are invited first. Everyone's NAT type is A. My Switch is designated DMZ on my router.

Anyone else had this problem? I searched around a bit but could not find anything. Any help appreciated.