As seen in the photo, I have 10 sherpas but can not claim the emblem.
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RaidReport tracks from raid launch. The in-game tracker was bugged for a few weeks and Bungie rewards uses the in-game tracker After they fixed the tracker, progress wasn't retroactively added and everyone started again at 0. You did all 10 of your carries before the tracker was fixed and so unfortunately need to do another 10 to get it.