How did Tencent Health QR code become a blue and black QR code for vaccination?

1. In some areas, the QR code is black, and it is ok to scan the code without abnormality;

2, not enabled, not real-name authentication, real-name authentication;

3, due to network problems, update the network;

4. If there is a bug in the software, uninstall the software and log in again;

If it still doesn't work, please consult the local health regulations manager to solve the problem.

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.