What should I do if the verification code fails to be sent to the air class?

The solution to the failure to send the verification code in the Sky Classroom is as follows:

First of all, please check the spam text messages and intercepted text messages on your mobile phone. Due to interception by the mobile phone security software, the verification code text messages in the Sky Classroom may be blocked. Intercepted into the trash.

Secondly, it is recommended to change the mobile phone number or mobile phone plan before trying again, because the verification code sent by the online classroom will be restricted by the mobile phone service operator's business, and mobile phone services cannot be processed.