Usually quests like these will be marked on the galaxy nav....but it isnt.
Well when i talked to the Elcor it seemed like it was one of those missions where I pretty much just fight in a single area and get evac'd....then i thought maybe its one of those 'artifact' sidequests that are unmarked...but no because theres another sidequest for the same planet, Dakuuna, that requires me to get an artifact...
so...why is it unmarked, and where the f*** is it?
catsimboy posted... If it doesn't give you a marker you may have scanned it already, talk to the diplomat again and see if he lets you finish the quest.
Did you get the Elcor squad already? If so, you have to exit the citadel entirely and come back in. Then you'll get the dialogue to complete the quest. If you don't have it, you might as well scan everything since you would want to do it anyways to get more war assets.
Litte-known-fact: There is an outstanding guide written by one Noz3r0 (me) that has a section just for this very question! Answered in the above post, the area for it does not unlock until you advance further in the game.
Contributor name: noz3r0 Currently writing a guide for: Shin Megami Tensei: Devil Survivors 2