Not getting credit for seasonal challenge goals

So I'm playing in a party with my husband but sometimes one of us won't load into the session when we start it and won't have access to the menu or anything and have to shut the game down and start it over again. This is a problem because when I load back in, I'll have "completed" all the objectives of the session if my husband finishes before I get back on but they don't count towards the season 1 challenge goal total even if I do it again with him. We are not sure what to do about it.