i did the xenology quest and after i go to xur the quest was gone but i didnt get the exotic code from the quest. its also not in the post
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Ascendant Shards/Enhancement Prisms/Exotic Ciphers don't go to the postmaster by design if a player already has a max stack or no open consumable inventory slots when claimed. Xur will have a new Xenology quest when he returns next Friday.