Why is the verification code of health code always wrong?

Unable to get the health code because too many users apply at the same time. You can try again later. If the network is not very stable at the time of application, the acquisition will also fail.

Because the verification code is issued by the SMS gateway of each operator, if the number of requests is too large in a short time, resulting in SMS congestion (such as peak hours), the verification code will not be received, resulting in the failure of the verification code.