Why doesn't the health code face recognition machine respond when it is turned on?

Wear a mask. The health code face recognition all-in-one machine does not respond when it is turned on because of wearing a mask. You can take off your mask and try again. Health codes are based on real data and are declared online by citizens or people who return to work after rework. After background audit, personal QR codes are generated as electronic certificate for them to enter and leave this area.