Issue paying off JOD lease early

I’m trying to pay off my iPhone 11 Pro Max JOD lease early but it seems t-mobile is not giving me the option to. I preordered a 12 Pro Max on EIP and I’d like to pay off my JOD 11 Pro Max so I can unlock it and sell it but the t-mobile store is telling me since I placed an order for the 12 pro max I will be billed for the remainder of the 11 pro max and I will not be able to pay it off until it shows up on my bill. Is this true? Thanks for any insight.

EDIT: I’m looking at the app now and it looks like the rep I spoke with over the phone marked the lease as completed so that was probably what was preventing me from being able to pay it off in store. Can this be undone?