Hi,
There are two options I can see:
- The code you entered in the checkout is not exactly the one you have in the settings of the coupon. For example, if you have a space at the end of the code... So please double check on that.
- You have a third party extension/plugin implementing the triggers onBeforeCouponLoad or onBeforeCouponCheck and messing with the coupon system of HikaShop in some way. Please check that it's not the case or deactivate the said extension and see if that helps. If it does, you'll have to contact the support of that extension.
Please don't bump messages unless you waited more than 24h. Otherwise, you'll have to wait even more.