parental controls/child accounts

Meisun is not correct.

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Child accounts cannot download M or RP content that is free as that is considered advertising. However, child accounts CAN purchase M and RP content if your parental settings allow it. The parental account attached to your child account can manage these
settings.

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support.xbox.com/.../xbox-live-parental-control

Only the parental account can remove the parental control from a child's account.

Because the system is designed so that parents account then creates child accounts as necessary and maintains parental control of all children in their family, not so that parent let's child use gamertag associated with their account.

Thanks for the replies!

So when your son is able to sign into the account on the days that it is set to blocked is it possible that there is also an adult account signed in even though its not being used. If a parental account is signed in at the same time as the child account
then it assumes that the child account has permission since they are playing together. If the child has figured this out you can Set up a Passkey
to prevent the parental account from being signed in.

A passkey protects against a child signing in as the parent and overriding parental controls. A personal passkey prevents a child from simply clicking on the parent’s picture, signing in as the parent, and changing the child’s otherwise
parentally controlled settings.

Have you got a family account setup at all, or parental controls?

That may be the issue.

Try asking your parent/guardian to turn off their parental controls, and reply if it does not help.

If your parent/guardian does not know how to turn parental controls off, tell them to promote the Xbox Live account to an adult one, instead of a child one. You may have a child account, instead of a full adult account.