How can I change my existing apps to use Apple ID
Is there a way to go through my long existing apps and change them to use Apple ID?
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Many apps do not "use" an Apple ID at all so I am not clear as to the actual issues you are encountering. The main time many Apps need an Apple ID is if you are updating them, in which case you have to be signed in on your device with the account that was used to download them originally. If you are having that problem, you need to delete the app and redownload it with the current ID.
If you still have problems:
Contact Apple. Click here --> https://support.apple.com/choose-country-region Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> https://support.apple.com/HT201232