I recently received multiple umbreal engrams and when I went to the drifter to decode them, I noticed that the decoder was missing. After some research I realized it had been moved to the H.E.L.M. and it was accessed by a destination. The only issue is that the destination does not exist for me. I searched and no one else has this problem that I could find. I figured the game glitched and thus I re did ALL of the original storyline quests that are still available but it is still missing and I am running out of space in my postmaster for the engrams.