I cannot sign in when upgrading to a teen account.

When I open the ea app it pops up with a notification saying "Sign up for your teen account." So I click next and enter my email, then it says the email is already in use. It has a button to sign in so I click that and it takes me back to the same pop up with no way to sign into my original account. Any help would be great! Please and thank you.

I have already tried to login on the website, which works but doesn't transfer to the actual app.