Why is there no health code for Tianjin digital epidemic prevention tips?

Update maintenance. Tianjin Digital Epidemic Prevention app is an epidemic prevention and control service platform. App was updated and maintained on September 6, 2022/kloc-0. During this period, the software app cannot display the health code on the mobile phone, and it will prompt that there is no health code for the time being. The interface will always be displayed as being updated and maintained. After completing the update and maintenance at 8: 00 am on September 17, 2022, the health code can be opened and used normally.