Desyncs happen when one player's PC processes game data differently than the host's PC.
The game uses two communication channels: anno 1800 lan multiplayer link
Make sure all players have the same DLC enabled to avoid compatibility issues. Alternatives: Virtual LAN (VPN) Desyncs happen when one player's PC processes game
If the game does not appear in the lobby list despite being on the same switch, you can use the Ubisoft Connect overlay to force the link: anno 1800 lan multiplayer link
: Ensure every player has updated their game to the same version. If one person has a pending update, they won't be able to join the lobby.