Anno games sometimes crash and in addition to how long they can take being able to continue from a saved game is essential. So it's very disrupting that to many it will seem that multiplayer games cannot be continued later. If you simply host a saved game and invite other players and they simply accept, their joining will fail. Instead they should start/load a (singleplayer) game, then you invite them, they accept, now the joining process succeeds. Please fix this bug.