Having a Main Quest Line quest that requires entry to be given only if you are on that quest makes it almost impossible to complete, players can be stuck on this quest for weeks, unable to progress in the story. This should be fixed so that other players (friends and company members) can help you complete the quest. This is such a bad mechanic and should never be implemented in any game. Make changes to this requirement so players can enjoy the game.
Suggestion: Enable the entry of a party as long as at least 1 individual has the quest.