I don't know anything about this specific quest, but faction song isn't your problem. The only problem would be if you cast it on an NPC on Militia faction and then cast it on a different NPC on a different faction, like a vendor on Coalition of tradefolk faction, and didn't re-con the turn-in NPC before you gave him the item. You can only use it on one faction at a time, otherwise it lasts until you zone.
It may be that the quest requires you to be on the high side of Amiable, and faction song just barely put you into the Amiable range but like I said I've never did this quest so I don't know what faction it requires, but some quests are like that.
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