From looking online the only current way to progress the 0/1 exocit engrams decrypted portion of the quest is to hope to god that an exotic engram drops on the world floor, don't accidentaly pick it up. Go to tower and collect from postbox.
This really is not ideal and as my last main vanilla goal before hitting 290 for Leviathan raid I really want a reasonable way to complete this quest (not to mention the power boost will likely get me much closer to 290).
Thank you.
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Same problem with the quest, but also when I brought the so long awaited exotic engram, it didn't register.... Im fed up, we, [u]MORTAL PEASANT VANILLA PLAYERS [/u] are just extra meat punching bags in the crucible, because dlc players had to wait ages for 12 players to gather up for match so they grew the good chunk of vanilla players