If this error message appears, it means that the mobile phone number has been controlled and restricted by Alibaba Cloud SMS platform. The restriction rules are as follows: SMS verification code: send SMS verification code to the same mobile phone number with the same signature, supporting 1 message per minute, 5 messages per hour, totaling1message per day. SMS notification: Send SMS notifications to the same mobile phone number with the same signature and the same SMS template ID, supporting 50 messages per day.