1. Data entry error: it may be that the data was not synchronized with the Sichuan system when the health certificate was processed in Shenzhen, which made it impossible to query.
2. The health certificate has expired: If your health certificate has expired, the Sichuan system may not be able to query your health certificate information.
3. System failure: Sometimes, the system may fail, which makes it impossible to query the health certificate information.
It is suggested that you contact the local health department or physical examination institution in Sichuan to consult the specific reasons and solve the problem.