Unidays coupon not working

The Unidays 10% coupon was working a few days ago in my cart for the Logitech G29 racing wheel. The final price was $269.99 as seen in the screenshot linked below. Now when I went to buy it the same coupon and newly generated coupons won't apply to the cart. It says "This is a valid coupon code, but there are no matching items currently in your cart."