Ask customer service for information, or reopen it to see if the health code is wrong or there is something wrong with the phone.
Health codes are based on real data and can be generated by citizens or people who have returned to work through online declaration and background audit.
As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.