I picked up the Unveiled quest last season but never got around to it until today. I loaded into Veil Containment via the Launch button in the quest's details view (handy). I activated the prompt to listen to the veil messages back to back and when the last one played there was no further step and the quest had disappeared. Nimbus had the quest to give me again, but when I acquired it from them it never showed up in my Quests tab. Loading back into the Veil Containment via the destination map, there is no longer a prompt to hear the messages.