Excuse me, are you talking about the express function of China UnionPay? The applicable products of UnionPay small confidential fast payment include mobile payment (UnionPay HCE cloud payment, Apple Pay, Samsung Pay, Huawei Pay, Mi Pay, etc.) and UnionPay chip card with "QuickPass" logo.

Prompt you: If you need to modify the quick payment function of UnionPay, you can log in to the National Life APP and click Security Settings-Payment Management-Minsheng Credit Card Payment Management to enter the management page of UnionPay flash payment. ※.

If the card can't be used as you said before, then I suggest you check whether the card is in normal condition.