Messages from dingtalk

DingTalk is a communication and collaboration platform designed to help businesses increase their efficiency. It offers tools such as messaging, video conferencing, task management, file sharing and more. It also provides security features like two-factor authentication codes which are sent via SMS as part of the sign-in process. This is likely why you have received several messages from "DingTalk" with verification codes that must be used within 15 minutes in order to log in.