There are a few reasons why the Shopify discount code doesn’t work. First of all, check if you copied the coupon correctly- that’s quite a common and the most basic mistake. Secondly, make sure you’re not using the same coupon code from the same account twice - usually that works only once. Also, there’s a possibility that a chosen offer is not valid in your territory; or the company simply decided to withdraw the order even if it still was supposed to be working.