Did you do it it hard or normal mode. I believe you need to do it on hard mode
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Don't need to do it on hard, you can do it on normal mode as the challenge is the same, I've done it on two of my guardians one on hard and one on normal.
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Yeah I already checked, and No, I did not get it. Yes, I did it on hard mode, I did the entire raid on hard mode and we did the challenge.