Last week I picked up the quest and did 21 activities. Once I turned it in I got no exotic cypher anywhere. Not in my inventory, postmaster or vault. Note that I do not have an exotic cypher in my inventory to begin with.
I'm gonna try and do it again this week but I feel like this is a bug and that's really annoying because exotic cypher is really hard to come by...
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You don't have a Cipher in your inventory right? I want to do the Quest but I keep reading it doesn't give you anything