I recently got "Primeval Prime" from a meatball drop and "Drink At The Well". Neither were at the post master, but both show as unlocked in my collections. I have space to bring them onto my character, but they just flash red, and there is no (A) reacquire prompt.
Clip: https://imgur.com/iBlFqPN
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Hello, Those are both emblem variants (of Playin the Odds and Secret Victories, respectively). If you inspect those emblems you should be able to equip the variants.