It should be a big data record error, and there are generally backstage personnel who can contact.
Another reason is that people in code yellow have been to other places.
If you are sure to be together all the time, it is a backstage problem.
The following reasons may cause the health code to turn yellow:
1. I have recently moved and stayed near the key places where confirmed cases or asymptomatic infected people have stayed, and may have had contact with confirmed cases and asymptomatic infected people.
2. I have a fever recently and went to a medical institution to see a doctor.
3, recently been to the epidemic area, and stay for more than 4 hours.