Unfortunately, Revolut does not allow external payments to accounts for users under 18.
If you're using a Revolut <18 account, please reach out to our support team via live chat. We’ll ask you to provide the Revolut Tag (@username) of a parent or legal guardian, so we can safely send the payment to their account instead. In this case remember to also put the full name of the account owner so that it corresponds with the RevTag.