It may also be because a large number of people get health codes in a short time, which leads to system paralysis. Too many people declare at the same time, which leads to great pressure on the system and blocked operation.
Health code is a personal two-dimensional code based on actual real data, which is generated by citizens or people who have returned to work on their own 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.