Deleting child’s old apple accounts
How to delete a child’s old apple account if unable to login to that account?
iPhone 13, iOS 15
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You can't delete the account if you can't sign in. See the Apple Support article(s) below.
How to delete your Apple ID account - Apple Support
Why can't you sign in?
If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.