Hi Can you invite anyone to a mission checkpoint as long as they have done the mission already? Tried to invite s clan mate to my fireteam and tried to start but said activity unavailable due to fireteam member not at same progress in mission. Thought they had completed campaign. My checkpoint is the last one in The message mission. Still trying to jump with matter spark can get 3 of 4 servitors but the gate on bottom left side as you look at boss gets me on its final jump every time. Is this actually bugged I wonder? A week later and still no luck……..getting farcical now. The dual sense flew out open patio door onto the lawn at one point.