Does anyone have experience managing a club that has an Italian B team, and able to get the B team to be competitive?

[paz]

Managing Juventus and really struggling with the rules for registration for the B team.

Even when setting a non over 21, non50game app player to play for the B team, he doesn't seem to do so. Also when trying to play a gk who isn't registered to the A team, it doesn't let me register him for the B team. The registration fails because it says I don't have the minimum amount of players registered for the B team.

I feel like this is a bit user error, a bit bad explanation from the game and a bit of a bug. So would appreciate any advice from people who have managed to get people playing for the Juve B team during the season