There are two possibilities for this situation: 1. Access to the health code system has reached the limit. If the system needs to be upgraded, the health code will be suspended, but the suspension time will not be too long. 2. Your health code has expired, so you need to apply for a new one.
The usage method is as follows:
1. Open WeChat, click "I", and then enter the payment option.
2. Choose city services.
3. Select the city service address and health code.
4. Click "Allow" to obtain location information, and click "Confirm" in the pop-up login verification prompt box.
5. Check Agree, and then click Start Face Recognition.
6. After identification, click Health Statement Service.
7. Fill in the contents to obtain the health code.