logon
When logging onto a new device I am requested to enter a passcode from a device that is no longer on the iCloud account being used. Why is iCloud asking for verification from the device is no longer associated with the iCloud account?
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You are welcome. If the account has 2 Factor Authentication enabled, is it asking for a verification code? 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.
I don't know of a document that covers what you are trying to do.