This usually happens if the coupon has expired or if the discount conditions are not being met. The error shows the reason for the coupon not being applicable or the discount not being applied. For example, if the coupon has an expiration date and that date has passed, the system will not accept the coupon code. Similarly, if the discount conditions require a minimum purchase amount and this requirement is not met, the discount will not be applied. The error message will provide specific details about the issue, allowing the user to understand why the coupon or discount is not being applied and take appropriate action.
If you know that everything is correct and the coupon is still not working please fill out this form.