Re: My son can't play online despite PS4 settings allowing him to.

You're not on your own.....this is an issue for others too (link below). Seems to be PS4 specific as PS5 version on same account working fine.

https://answers.ea.com/t5/Technical-Issues/FC24-PS4-Parental-Controls-not-working/m-p/12984107/highlight/true#M7619