Why can't I submit my health code with empty parameters?

This is caused by an error in the input information, and the solution is as follows:

1. First click Alipay in your mobile phone, enter "health code" in the search bar, and click Search.

2. Then in the page that opens, select the service city.

3. Then answer the health information in the page opened here.

4. Then click Submit, as shown in the figure below.

5. If the application is successful, you can check it in Card Package-Certificate.