That's what I did. Nothing.
Lets see if that's right.
Start at your cart.
Is it something sold by Amazon?
Start to check out:
ship to: whereever
payment method: click the cc with the points you're using.
lower down click 'pay with points' - let them add all the points they want. DON'T adjust amount.
click 'use this payment method'
Discount should appear in order summary.
final check: change the amount of points to .01 Discount stays.