Failed to send the verification code of Mi You agent.

1. When designing SMS verification code to send content, enterprises should pay attention to whether there are prohibited words in SMS content.

2. The signature format of SMS verification code is incorrect or inconsistent with the signature submitted for filing, which will also lead to the failure of sending.

3. The number of times of obtaining the enterprise SMS verification code exceeds the set range. In order to prevent being swiped, the number of times to obtain the verification code of each number every day is generally set. For example, for users with the same mobile phone number or the same IP address, send SMS verification code at most 5 times a day, 2-3 times an hour, and the effective time is 10-30 minutes. If the set number of times is exceeded, the distribution will also fail.

Second, the reasons for the third-party SMS verification code platform

1. Does the SMS channel provide a direct channel for SMS operators? If not, the SMS verification code may be delayed or unable to be sent.

2. Is there more than one backup sms channel? When the main sms channel is provided, it is unstable in sms channel and there is no backup channel, so it is easy to fail to send short messages.

3. Whether the interface of SMS verification code is stable enough, whether the interface technology supports high concurrency, and whether there will be problems such as system crash, system error, failure of SMS verification code acquisition request when users visit a lot.

Third, the operator's reasons

Usually, the operator's problem is relatively small, but it is also possible that in the process of sending, packet loss is very small and can be retransmitted.

Fourth, user reasons.

It is common that the SMS verification code cannot be received due to user reasons, as shown below:

1. The user's mobile phone number is blocked by the operator, so the user can call the operator to cancel.

2. When the user's mobile phone is in the blind area of signal coverage (such as basement, deep mountain, etc.). ) or areas with network signal shielding (such as parts of Tibet). ), you may not receive the SMS verification code.

3. The user's mobile phone number is in arrears, turned off or stopped.

4. Intercepted by SMS interception software.

5. The user has set a blacklist in the mobile phone security software, and some mobile phone numbers are not allowed to send short messages to themselves.