TheWoWDBWowhead's quest log and Wholly/Grail flag this quest as incomplete, and I can't accept or complete it. It is probably related to the fact that for most dungeon breadcrumb quests a new one was implemented when the dungeon system changed in 4.3. Some are doable, some are considered identical. This is one of the latter; you can move to Shadow Labyrinth directly to do all the new quests there.
It might actually be related to quests that involve reputation gains, in order not to gain from the same quest twice. This I haven't tested or investigated thus far.
EDIT: on my new alt I had actually done all four Auchidoun dungeons and all quests inside before checking up on this quest. When I flew into Shatt at 70, this quest was available to me. So for players for which this quest is not available, it is very likely related to the fact you have done the previous quest and gained the rep before, therefore it is locked out.
Quest
Trouble at Auchindoun
A World of Warcraft quest in Shadow Labyrinth. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Does not count towards Terror of Terokkar or Loremaster.
i made i playthrough of this quest if anyone wish to see how to do it :)
https://www.youtube.com/watch?v=7ijmpsDKYvs&feature=youtu.be
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(29642))
Description
I have spies within Auchindoun and they have been sending me disturbing reports. That place has been nothing but trouble ever since it exploded a couple of years ago. Something in there has gone horribly wrong - again - and the Shadow Council is now on a war footing. Though the reports were lacking on details, their preparations appear to be directed inward. You must make your way to the Shadow Labyrinth. My field commander, Mahfuun, will fill you in on what needs to be done.
Getting there
Inside the dungeon: Shadow Labyrinth
The original exiles on Draenor found death to be an unsettling and unfortunate consequence of life, and so the draenei hid their dead away in the subterranean grave-city of Auchindoun, a labyrinthine marvel located beneath the forests of Terokkar.
Bosses in the Adventure Guide, in order: Ambassador Hellmaw, Blackheart the Inciter, Grandmaster Vorpil, Murmur.
Entrance: Auchindoun, Terokkar Forest at 39.6, 73.8.
Instance text, bosses and entrances are the client’s Adventure Guide data.
Community notes from Wowhead · 7 comments
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Reward details
Reputation: Lower City +150
The refugees of Shattrath come from diverse backgrounds and races. Word of helpful deeds spreads quickly among the Denizens of Lower City.
Reputation group: Shattrath City.
Other quests in Shadow Labyrinth that reward Lower City reputation: WANTED: Murmur's Whisper (+350), WANTED: Malicious Instructors (+250), Find Spy To'gun (+250), The Soul Devices (+350), The Codex of Blood (+350), Into the Heart of the Labyrinth (+500).
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.