Affirm payment option in web store creates order cancellation email at Affirm hand-off

I'm trying to use the the Affirm payment option of the Apple web store. I'm pre-qualified. As soon as I choose the Affirm payment option for my cart it sends me to the Affirm side to complete the payment schedule details. All good. But with that hand-off, Apple immediately sends an email that the order was canceled due to a payment issue.

That doesn't instill confidence so I won't complete the Affirm process until I investigate this. Is this normal? Is it supposed to work this way?