Apple ID
I accidentally created 2 iCloud Apple IDs for my child for our Family Sharing. How do I delete the one unused Apple ID for my child?
iPhone 7
You. can try the below.
All purchases made using an Apple ID are tied to the ID. Delete the ID and you will need to download them using your new ID. Make sure you sign out from the places in the 4th link before deleting the ID.
How to delete your Apple ID account
What to do after you change your Apple ID or password - Apple Support
If necessary, contact Apple ID Support.
Apple Support by e-mail or chat Work through the screens to get a chat option.
Or fill out and submit this form. The form is for iTunes, but it will get passed to the ID Support section.