Killavolt and his Arena

I’ve done Lectra City and Killavolt. Now on mayhem 11, I’ve gotten all the way to the arena … and the door is shut… is there something Im missing?

Could be just a glitch, maybe check if you finished the Moxxi part to complete the mission

Completed the original mission. Completed all side missions and crew requests on the map. about to see if it’s open. Thankfully then it was unlocked.