My daughter has an Xbox Live account as do I. We are currently trying to sign in to her account to add a new email address to it. 

When we attempt to sign it on the internet it prompts that she needs parental permission to make changes and use the account over a browser (which is fair enough). 

It then asks for the parent to sign in with their Live Account. When I sign in it informs me that I will need to prove I am an adult and that I will need to make a credit card transaction. I am not sure why you need to do this when you already have my credit card details on my account. 

When I click the button to proceed it then takes me to a page where I am required to fill in my address and credit card details. However, the page seems to assume that only US citizens would want to have a Microsoft Account. The county is hardcoded to the US and thus the page is asking for Zip and State information that I can't provide as I live in the UK.

The options for Category and Product don't really cover this either so I have had to guess the best choice.