1. The health code is black, indicating the personal information submitted by the user. The applied health code is under review, and normal colors can be displayed after review, such as green code, yellow code and red code.
2. Due to network and other reasons, the health code image cannot be refreshed in time. Open the network data, click the refresh button, and try to update the health code to get the normal color of the corresponding health code.
3. The user who applied for the health code failed to pass the authentication, and needed to retry the authentication to obtain the normal health code.
4. The WeChat health code is displayed in black. Maybe the user didn't have enough time to punch in or the health code was under review. The status of the health code is pending release, or it may be a system update of the health code. The equipment doesn't respond, you can try refreshing it. It is also possible that the location service is not turned on.