1, coupon code has expired: Wallace coupon code has a limited validity period, and the coupon code you purchased has expired and cannot be used.
2. Inconsistent conditions of use: Wallace coupons will be accompanied by some conditions of use, such as store restrictions, commodity restrictions, use time restrictions and so on. You can't use it if it doesn't meet your requirements.
3. Network delay: In some cases, there will be problems in the use of coupon codes due to network delay or other reasons. You can try to clear the cache, log in again, or contact Wallace's official customer service to solve it.