If you can't brush it sometimes, it's the network reason of your mobile phone. It can be displayed when the signal is good.
About the entry of health code, it is explained that health code is based on real data, which can be generated by citizens or people who have returned to work through online self-declaration and background audit. As a personal entry and exit area in electronic certificate, the QR code can be declared once, which is universal in the whole city. In fact, the health code is a digital health assessment certificate first issued in February 1 1 in Hangzhou, Zhejiang Province, aiming at electronicizing the pass and realizing the dynamic management of green code, red code and yellow code. In other words, the health code is a passport to enter the relevant city, which is applicable to all people in the relevant city and is to be returned.