as the title says, Duality dungeon clears are not counting towards the In Candescent triumph
swapped to solstice armor while on the 'load' screen though, could be that the qualifier is taken before loading into the activity
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For whatever reason Duality does not grant progress toward this Triumph; you will instead need to complete a different Dungeon while wearing full Solstice gear. (΄◉◞౪◟◉`)