It could depend of season level - I had a problem with tier II umbral engram of linear fusion/RPG. Focused umbral engram was usable (violet) when I reach 30 season lv and take linear fusion rifle from season rewards.
English
-
nah it doesn't depend on season level. cause this is the only one in the tier 3 out of all the ones i've completed that's marked as "completed" but it won't unlock. it's 100% a bug and hopefully it gets fixed soon because i'd like to farm for a god roll rocket with a second perk choice to have my optimal DPS.