Why do some people have complete ID cards and some people don't?

Because the settings are different.

Open the electronic health certificate. There is a name in the upper left corner and an ID number below, but not all of them are displayed. You can click on an eye pattern and you will see all the names and ID cards.

Health certificate is a health certificate issued by the health and epidemic prevention department after a physical examination of employees engaged in food safety production or related work, which proves that the person can engage in related work. The health certificate is handled at the local CDC and is valid for one year.