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

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This offer is eligible to Watsons Hong Kong eShop only. Only for MoneyBack APP members. 
This offer is only valid on 19 Oct 2024, MoneyBack Member 
1.    ***** purchase selected items upon $388 and enter promo code 【WTC388】 to save $50 *****
2.    ***** purchase selected items upon $699 and enter promo code 【WTC699】 to save $100 *****
This discount cannot be used in conjunction with other promo codes.   
During the promotion period, all Watsons cash/till coupons will be suspended. This offer is not applicable to purchase of Gift Voucher, MoneyBack Thankful Promotion, Infant Baby Milk Powder(Stage 1),  Bill Payment Service, Phonecards, All Reloading Service, Plastic Shopping Bag Charging, Redemption items, Designed Point/ E-stamp Redemption Items, GLAM Haircare Products, #1DAYonly offer, Non-Discountable Products, new member promotion offer, Subscription Program, Body Check & Vaccine Package, Kai Tai Counter, Chinese Medicine Practitioner’s Consultation Services, Online Medical Service, Dietitian Consultation Services and Prescription Products. Pre Order items, Supplier direct delivery items (Including e-Voucher), $1 Crazy Deal items. 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.