How can I setup Playstation 4 to allow my child to play FC25 online?

Is there any solution to this apart from creating a new EA account? I can’t even unlink my current account as it’ll not allow me to log back in for a year….!   All my 9yr old wants to do it play online with his school friends I’ve allowed him full access on the game but still can’t play online £70 for a game for his birthday he’s fallen out with because of this issue it needs fixing ???