I just went through the Prison of Elder's, level 32 this week and used my treasure key. I did not get my exotic. I got a Queen's Wrath Autorifle, and there was nothing waiting for me at the Postmaster's. I was on my Titan. Not sure what to do other than post here and request help. Thanks!
Edited to add: Went through it on my lock. The only thing I got was 1000 glimmer from the chest. :/ Also got my armor core, but still, what happened to my exotic?
-
I don't think it's a guaranteed exotic