Struggling to get coupons to work

-- url of the page with the problem -- : thescienceoffiction.rocks
-- HikaShop version -- : 4.4.0
-- Joomla version -- : 3.9.24
-- PHP version -- : 7.4.14

I can't seem to get the coupon feature working.

I have created a coupon for a specific product (see settings image) and added that product to my cart. When I enter the coupon code I get an error saying the coupon isn't valid (see checkout image).

Where am I going wrong?

Seems to be working fine for me now, typical

Is there a way to add a line item for the coupon to the checkout table, showing the reduction in value, in a similar way to when using points?

Like,
Coupon -£1.00

Ahhhhhhhhhhh