The faction-neutral NPC Akama in the Warden’s Cage, Shadowmoon Valley, does not respond to npc interaction, effectively blocking any quest requiring talking to him from being completed, including An Artifact From the Quest, one of the last steps in gaining attunement to Black Temple.
There are 3 hostile(but not attackable) NPCs standing nearby, Vagath and two Illidari Temptresses. They do not do anything even after an hour’s time passes.
Akama will need to be reset or something to otherwise make him interactable and allow completion of the quest. I dont know if this is server specific or what not, I am on TBC Classic/Westfall and this is currently the case.