Edit your cart promo code does not work

[gseales]

I have a coupon code that works fine when I use it on the cart that shows on side of screen.  However, when I am checking out and click on edit cart to try to enter a promo code it does not work.

[Dmitry_Fedyuk]

I have tested a coupon application on a frontend checkout screen just now and it works correctly for me: https://mage2.pro/t/821