If you already did the exo challenge for the tier 1/pinnacle, there is a campaign mission on the left hand side of the map called Simulation: Survival. (Might be a different simulation after reset) You can replay this even after you do your milestone. Hope this helps
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This worked for me. I did the exo challenge initially with another person in my fireteam and that did not progress the quest. I deleted it and recovered it from the tower, then did the simulation solo and it progressed the quest that time
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I have ran that 3 times and it still does not progress the quest sadly.
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Damn :(