XBOX linking with EA, child account not allowed, even with 18+ content setting

Problem:
XBOX child account cannot install or play any online games with EA using Game Pass, not even Plants vs. Zombies Battle for Neighborville, which is a game with 7 years age limit.

If you create a account with parental email, you come up with 404 error on EA App and game cannot be installed or played. This happens with both PC XBOX app and XBOX console.

Age limit on XBOX account and EA account have no effect at all with this.

Also if you create a new EA account (adult), it is not possible to link the account to XBOX account even if parental settings are changed to allow 18+ content.

Also you cannot unlink EA account yourself, EA chat support is needed!

What is wrong with you EA? This is extremely hostile against paying customers!

I have tried to sort this with chat, I have tried new account 3 times and now that I want to ask about linking that new adult EA account, EA chat is inaccessible completely, have I been blocked some how??

I am NOT creating a new XBOX adult games account for my child to allow unrestricted content, this would also mean losing progress on other games!