There are several reasons why your promo code might not have worked:
1. **Invalid for your items**: Some promo codes are specific to certain products or categories.
2. **Minimum cart value**: Certain promos require you to spend a minimum amount before they can be applied.
3. **Sale items**: Discount codes often do not apply to items already on sale.
4. **Expired code**: Coupons have expiration dates, and using an expired code will not work.
If you encounter any issues with a code, please let us know so we can investigate and update the information accordingly.