Can't play couch co op franchise

Yes we are playing off line franchise mode. Could you explain more about assigning my son to the other team in Franchise settings? I have looked in the settings and do not see any options for assigning a 2nd player. He is able to be the team I am playing. It just won’t let him move onto my team. I did try what you suggested with turning the controller off but had no success. All it did was move the primary controller into centre of game screen so it’s on neither team and I still can’t move the 2nd controller over to the franchise team. Thank you for the suggestion though and I will try anything else you could suggest to get around this defect.