Glitch creating child account

Cannot create child account (for a 6th family member including myself). It asks me to verify that I am an adult, tells me to continue with Touch ID but then instead asks for the CVV for my payment card (which I enter - correctly!), after which I agree to terms and conditions, and then I enter my child's name, DoB, create an email address and password, click Next, get a message about two-factor authentication, then there are Terms and Conditions, which I agree to, after which I get a typically useless message telling me, "There was a problem creating your new Apple ID. Your account cannot be created at this time."

Is this me or the system, and when will it be fixed?