Why can't I see a health certificate in Healthy Nanjing?

Network reasons. The health code can't be loaded, first of all, it is caused by network reasons. Users can check the networking status of the mobile phone, disconnect the network and then reconnect it, or simply turn off and restart the mobile phone, which can generally 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.