How can I approve a new iPhone without an old iOS device passcode?
How can I approve a new iPhone without an old iOS device passcode?
[Re-Titled by Moderator]
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Can I guess that the two factor authentication is asking for the passcode to one of the devices on your Apple account that you no longer have but forgot to remove from your account?
Best to contact Apple Support directly. Depending on your region, you may be able to reach them here: Get Support
After you have this sorted out make sure you have another method of receiving auth codes like another trusted friend’s mobile
https://support.apple.com/en-us/HT204915
you need to log into icloud.com and make sure the other devices are removed from your account.
https://support.apple.com/en-us/HT204074