We are having the exact same issue! Except when we click "continue on the account childs verification it comes up with an error code and says "unable to connect".
I have gone round and round with EA customer service and they completely refuse to help. They just keep giving us the run around saying to create a new EA account which we have done and makes no difference. They said they aren't able to make changes tons underage account. Their responses make zero sense. Then they told us "sorry we're unable to help you, anything else", like that's an even acceptable response? This is crazy. We need to blow up their Customer support and keep reporting this issue.