I'm playing as a level 28 Warlock who has completed this mission. My team member however, a level 23 Titan, hasn't completed this mission and has the Quest Mission in the bounty slot. Now, we've beaten it three times already together, and the last time I allowed him to get the final blow on the Fist of Crota, but it still shows as incomplete!
Anybody out there know what's going on?
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Possibly try letting the level 23 host the game, otherwise, im not sure.