Doesn't seem to be Bungie's fault. Check your parents.

I am the parent, and I have confirmation from PSN that they are not restricting my son from playing. I can start the title on the PS4 but when I get to the screen when it asked me to press "X" to play, I get a the online restriction error. According to PSN ( of which I have had many conversions with ) that is Bungie at fault.

I have a sub account that plays destiny. Not sure why you can't.

PS4 ? And what age is the sub account ( if you don't mind me asking )?

Ok. More information from PSN - Bungie "enforce" an online rating of PEGI 16 and therefore will NOT allow any subaccount under the age of 16 to play. My problem is that my son bought the title in Australia, which had a rating of "M". This is an advisory rating of 15 and over - there is NO legal restriction to buy or play this title, that would have been a rating of "MA". No where on the box did it indicate that an alternate rating system in use. That is a breach of Australian consumer law. Anyone from Bungie care to comment, I haven't seen a SINGLE official comment so far.

Still no reply from Bungie...

Here this might help. Change to primary ps4 and try some of the tips on this thread. Good luck. https://www.bungie.net/en/Forum/Post/88167045/0/0

Yes Ps4 and under 17. They recently updated it so subaccounts can become masteraccounts. I haven't tried that yet.

Subaccounts can only become master accounts when the account holder turns 18