Delete Apple id
How do I delete my child’s Apple ID?
iPhone SE, iOS 14
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Some people have been able to delete extra accounts using the steps in the articles below. Make sure you sign out from the places in the 4th link before deleting the ID. If you fail to sign out of your device before deleting the ID, the device may become useless.
How to delete your Apple ID account.
What to do after you change your Apple ID or password - Apple Support