****Requirements: Level 85, Burning Curiosity, The Reclusive Collector and The Keeper's Ring
As stated above, that isn't enough.
With that said, I did all the other hero tasks before doing the 3 Argin tasks, and that made me able to request it. (had 1 toon only do the Argin 3 tasks).
The only task, that was additionally complete in Cotf was the DE illusion Neriak task.
Hope that helps some slacker alts.