PS4 child account payment option?

Po
- in PlayStation
1

I got the free 14-day PS4 Plus membership on the main account (family manager). That worked well too. Now I can't use this PS4 Plus membership on the kids account. Say I do not buy stuff… So I want to download an addon for Fortnite on the kids account but that does not work because the kids account does not have access to PS4 Plus. Now I also wanted to add the 14-day membership to the children's account but you have to specify a payment method. But you can't specify a payment method on the children's account… What do I have to do now that I can download this Fortnite addon on the children's account via PS4 Plus?

Po

Would it work if I change the email on an adult account and indicate the email of the child account? Or does it depend on the email address whether it is a child account or an adult account?