Adult account stuck in parental consent loop

Parental Consent Why you're being asked for parental consent

If the date of birth on your Microsoft account shows that you're under a certain age, Xbox is required to request parental consent for you to use Xbox Live.

If you're an adult, but you got a message asking for parental consent, it's because you're a child in your Microsoft family.

Solution

If you're of an age that requires parental consent, follow the steps on your Xbox to have your parent sign in and add you to their Microsoft family.

If you're over the age requiring parental consent, have your parent remove you from the family. They'll have to sign in to
account.microsoft.com/family, select your profile, and select
Remove.

If you're unable to clear the message, contact Xbox Support.

Related Issues
Parental consent and Microsoft child accounts

Definition of a Microsoft child account

A child's account no longer appears in your family on Xbox One

I apologize for that but I'm glad you did find the solution and everything is working the way you want it.

Why you're being asked for parental consent

If the date of birth on your Microsoft account shows that you're under a certain age, Xbox is required to request parental consent for you to use Xbox Live.

If you're an adult, but you got a message asking for parental consent, it's because you're a child in your Microsoft family.

Solution

If you're of an age that requires parental consent, follow the steps on your Xbox to have your parent sign in and add you to their Microsoft family.

If you're over the age requiring parental consent, have your parent remove you from the family. They'll have to sign in to
account.microsoft.com/family, select your profile, and select
Remove.

If you're unable to clear the message, contact Xbox Support.

Keep in mind too that the system uses the age you used when you set up the account. While you can change your age anytime after the fact. It won't be recognized as your new age. This is to prevent kids from changing their ages to bypass things.

I couldn't find the child promotion option, so I did some research. After doing some searching on Google, I found out how to update my account. Apparently, there isn't actually a child promotion option on Xbox One. I ended up updating my account by getting
removed and re-added to my respective family as an adult.

The support article you linked seems to be 360-oriented; Xbox One isn't mentioned at all in it. But regardless, thank you for your reply. I wouldn't have gotten this far without it.