Help Recovering My Nephew’s Forgotten iCloud and Password

My nephew has forgotten both his Apple ID (iCloud email) and password, and he is unable to log in to his iPhone 15 Pro. We have tried recovering the account through the iForgot website, but we don’t have access to the recovery email or phone number associated with the account.

We need assistance in recovering his Apple ID and resetting the password. What are the next steps we should take?