Check the fine print for any exclusions or restrictions on the coupon code. Ensure the code hasn't expired and that it applies to the items in the cart. Try a different web browser or device to see if the code works there. Disable browser extensions temporarily, as they can sometimes interfere with promo codes. Clear cookies and site data to give the browser a fresh start. Use incognito or private browsing mode to avoid issues with stored data. Contact customer service for assistance if the code still doesn't work. Search for a new working promo code if all else fails.
