If the health code has expired, you need to log in again: 1. The health code prompt has expired, click OK.
2. Go back to the main interface of WeChat and click on City Service.
3. Then click the health code.
4. Enter the health code interface, and the page pops up expired. Click Update Now.
5. Check the health information, then check that I have read it, and finally click Submit.
6. The page pops up and the submission is successful. Click Generate Health Code Now.
7. After the page jumps, the latest health code can be generated.