I am talking about att retail trade in (buying phone from Apple with 36 month att installment)You enter your trade-in information on Apple.com or using the Apple Store app.
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Yes there was and it appears you missed it. If you got to the PIN and Installment agreement then you missed the trade-in step.
No you are supposed to return it through Apple. If you go to an AT&T Corporate store and not a Affiliate store (local licensee) they can help you fix this error.
ETA: add screenshot of the Trade-in Button on Apple.com...
Dave
I know how to trade in Apple retail trade in ($650 for my iPhone 15 pro max)
But I’m trading in the wife iPhone 13 Pro Max. For $1000 att trade in credit