Knoxx armory glitch fix help pls! (xbox & first run)

i need someone who can help me with the marcus mission. someone joined my game and glitched into the armory and now i have the ‘steel loot’ part finished but not the rest and i cant get through the door anymore… Gamertag: weezyoo420

I need some assistance with this one as well, went into a random players game while they were in the mission ‘It’s Like Christmas’. Solo’d Knoxx’s story myself the next day but I still have ‘It’s Like Christmas’ in my quest list activated, and when I reached the vault I didn’t turn in the mission to blow up the depot before it blew up. Somehow both the mission to blow up the depot and the ‘It’s Like Christmas’ completed, but I was unable to turn in the mission to blow up the depot as the first door that is suppose to open after entering the code is shut for me.