Change from parent to child email address

When the Xbox asks for the email address connected to the child account put in the parents email address/password instead and it will work (parents email address being the one used to verify the child's account when it was first created or to accept changes
to the child account), I think this only happens when the parent email address is not the same as the primary account holders email address. I have just had this problem tonight. Xbox support told me of this and it worked first time

Debate - your "solution" isn't a solution as you can neither log into the child account or as a parent to change the email addresses.

This is not helpful as I've already stated that this method is outdated and you cannot change your child's email address while signed into your own account. There is no place to change it. The only method is to sign into Microsoft with your child's login information and add an alias or second email address. But the parent cannot do this from their account. The problem is that if your child no longer has access to their old email address (hence the reason for changing it), you cannot confirm the login as Microsoft requires you to authenticate the login attempt with a code. If you don't have the email address, you cannot receive the code. I'm not sure why the brains at Microsoft haven't thought of a workaround for this and instead, my kid lost two years of game play from their account.

remove the parental email from your child account only if it is 18 and over

If not you will be asked for another email and no your cannot change the age

My xbox live is asking for a parents email address and password to be able to accept them on my xbox, even though my profile has been changed from a childs a good few years. And now, we don't know the password and there is no other option