"Account does not meet minimum requirements"

I had the same problem. The error message tells me to visit help.EA.com for more information, but there is no useful information to be found. However, I was able to get it working by setting up an Origin account for my son and then linking that Origin account to the new PSN subaccount I created. Here are the steps (from memory, hopefully I didn't screw one up):

1. Create a PSN subaccount for your kid

2. On PS4, try go play BF4. You get error message saying "Account does not meet minimum requirements" Booo!

3. In a web browser, go to origin.com. Logout if you are already signed in.

4. Create a new account on origin.com for your kid.

5. Logout of the origin account (yes, logout again)

6. Select Login again (yes, AGAIN) but this time choose the PSN option at the bottom of the Origin login screen. Sign in with your kids PSN subaccount.

7. Origin will now ask you to link the account. Link it to the account you created in step 4.

8. Now, finally, on PS4, try to play BF4 using your kids PSN sub-account. You should be good to go.