If a coupon code for store.ampopmusic.com isn't working, there are several steps that can be taken. First, ensure the promotion code is being used correctly. This can be done by reading the terms and conditions of the code. Not all items may be eligible for promo codes. Also, the promotion code might be an in-store promotion code, which cannot be used online. If these issues do not apply, check the entered promotion code. It should be entered exactly as it appears. Common mistakes include spacing, character errors, spelling mistakes, and case-sensitivity issues. Also, the numbers 0/1 and the letters O/I are often mixed up. If the promotion code is valid for the order but still doesn't work, contacting customer service may be necessary. They can troubleshoot the issue and possibly provide a replacement promo code. If these steps do not resolve the issue, it may be a problem with the coupon code system of the store. In such cases, reporting the issue to the store is recommended. They can investigate and potentially resolve the issue. Remember, each store has its own policies and procedures for handling non-working coupon codes, so the exact steps may vary. It's always a good idea to check the store's FAQ or customer service page for specific instructions.