I have completed the entire lightfall campaign with the same fireteam start to finish but for some reason from the mission "Headlong" and onwards I alone did not get credit for mission completion... this normally wouldnt be an issue and i would normally fix the issue by doing it again but... headlong is an awful mission and i refuse to do it again... i just want the credit for the legendary completion and the exotic for beating the campaign like the rest of my fireteam
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Your most likely going to have issues with step 13 when you get there as well, since you did the strike with your team. I'd look into the issue and work around ahead of time so that you don't get screwed over again. Same thing happened to my GF, my and a buddy for full credit, she was still on that mission. We backtracked to get her campaign done but she got stuck on the strike not counting. 7ish clears of the strike later she was able to continue and finish the campaign. Needless to say she didn't have a very good time.