Bungie made a comment on a thread like this earlier.
They said currently exotics do not count towards the bounty. Its a bug. But you'll just have to find another rare/legendary to dismantle
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I guessed this would be the case. I had attempted to find any other threads regarding the issue but due to the mass posts of other issues with Pocket Infinity there is literally an overwhelming number of posts to sort through. Thanks for the heads up / confirmation.