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. Clear cookies, cache, and site data in the browser settings. Disable browser extensions temporarily, as they might interfere with the code. 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.
