Caution👀: Why does it say ""Coupon code is invalid"" after entering the Promo Code?

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Terms and Conditions
This offer is eligible for Watsons Hong Kong eShop only.  Only for MoneyBack members.
 
This offer is only valid from 8-21 Jan, 2025, MoneyBack Member Purchases selected Bone & Joint / Adult Nutrition Items:
 
***** Upon $350, enter promo code 【BNJ30】to save $30 *****
***** Upon $888, enter promo code 【BNJ100】to save $100 *****
 
Only 1 promo code can be used per order.
Calculated on a single invoice and discounted price. This discount cannot be used with other promotions. During the promotion period, all Watsons cash/till coupons will be suspended. This offer is not applicable to purchase Fixed Price Item, Subscription Program, Body Check & Vaccine Package, Kai Tai counter, Chinese Medicine Practitioner’s Consultation Services, Online Medical Service, Dietitian Consultation Services, Prescription Products. For more details regarding 'non-discounted items’, please refer to: qrs.ly/8hg27kr
In the event of disputes arising out of this promotion, the decision of Watsons shall be final.