Yesterday I could reset my rank at Master Rahool but didn't get the exotic cipher as a reward. So I decided to get the Xenology quest from Xur and today I finished the quest. Result: no exotic cipher again.
That's twice in a row I missed out on this reward. Why present the possibility to upgrade your exotic armor when you don't give the players the items they need.
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How many do you have in your inventory? The cap is 5