How to change the email address associated with Apple ID.
Email provider has discontinued service. Email can’t be verified anymore. How to change to new email
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iPhone XR
Question marked as
Follow the steps listed in Change your Apple ID, "Learn how to change the email address associated with your Apple ID."
That Support Article explains "If you no longer use the email address that's associated with your Apple ID, or you no longer have access to it, you can change it. You won’t lose access to your contacts, purchases, or other account information."