You'll need to setup an Origin account for your child. I had to do the same thing for my son and he was able to play fine afterwards.
I am having the same issues as the poster. My kid tried logging and playing under his child account as well but asked for origin account info which he does not have. I am able to play just fine with mine.
Have either of you guys had xbox live long enough to have changed the primary email address that you originally signed up to xbox live with? When I created an account for Batttlefield 4, the xbox one took that original email address... which I rarely use anymore... and used that instead of my current primary email address for live. Thus logging into origin would fail if you used the wrong credentials.
Thanks for the reply, but no I have not changed my primary email address. I appreciate the thought though.
