My verification is set to my old phone number. Please help.
How can I verify my Apple ID of the verification is my old number?
iPhone 11, iOS 14
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See if anything here helps. If necessary, you can use account recovery as explained in the link at bottom of the article.
Verification code - how to get one and sign in with two-factor authentication.
You need to change/add the number on your Apple ID. After the change, allow up to 24 hours for the change to sync. Before trying to make the change, sign out of Messages/FaceTime on all devices/computers.