not allowed to make purchases with my account?

Hey there Bryceb3939!

Have you had a chance to head on over to account.microsoft.com to make sure your billing information is correct and up to date? Let us know

No error code it just said no child or teen accounts are allowed to make purchases my account is an adult account

Currently his account doesn't allow him to make purchases. Can I give him gold access and still prevent him from making purchases without my authorisation?

Firstly changing the date of birth on a child account is not going to change it to an adult account on its xbox profile.

if the child account is set so that it can not make purchases the easiest place to go to make that change is account.microsoft.com/family and sign in with the parent account and it should give you the option there to allow purchases by the child account.
then when you are finished making the purchase if you don't want them to be able to make purchases again you would just go back to that same website and choose to not allow them to make purchases

It won't let me do it on xbox.com and it said

"Purchase of this content is currently not allowed for child and teen accounts. If the Parental Settings for your Xbox LIVE account allow you to make purchases, you can purchase this content using your Xbox console."

Just my luck. Is there any way out of this??