As the title said, you need to be level 90 to be able to unlock the level 80 one, the reason is that level 80 research needs tier 3 progress, that means B missions (unless theres a C mission that gives t3, havent gfound any ) and you can only do B missions at level 90. meaning that even if you are leveling up using cosmic thheres a weird spot there from 70 to 90...
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