I have had similar issue in Colorado store on 10/27 and 10/28/2023 trying to drop off deferred trade ins (delayed trade in to transfer data to newly purchased T-Mobile phones). I was sent mailing labels but when I tried to print it reported system errors. The store reported T-Mobile is transferring to new trade in system on 10/27. I called T-Mobile phone support today 10/28 and they were able to send UPS shipping labels and instructions for returning phones today. Will package up and drop off to UPS.
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