Your team score is shown at the bottom right of the screen while in the Nightfall—that's the score that needs to be over 100K. Those individual scores in your screenshot aren't combined to make the team score for this challenge.
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It does add up to over 100k, which is the weird thing. In game, it said the final score was only 87,500ish. but I added all the final scores up and the total is 113,892.
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What I'm saying is that the score you get from combining those individual scores is not what the challenge looks for. If your score during the strike was ≈87,000 then that's the score it went off of.