Unable to send BBK Parental Management Verification Code.

There are several reasons why BBK Parental Management Verification Code failed to be sent.

1. Sending failed because the SMS signature is inconsistent with the submitted signature. Solution: Correct the SMS signature and resend it.

2. The verification code is invalid. Solution: Clear the data managed by parents, and then start counseling again.

3. The phone number entered by the user is incorrect. Solution: Check whether the phone number is correct and re-enter.