An Azure service that enables bidirectional communication between internet of things (IoT) devices and applications.
Hello @VIGNESH V
Device Update for IoT Hub allows deploying an update to a group of IoT devices. To create a group, the first step is to add a tag to the target set of devices in IoT Hub. Tags can only be successfully added to your device after it has been connected to Device Update.
The below documentation describes how to add and update a tag.
https://learn.microsoft.com/en-us/azure/iot-hub/iot-hub-csharp-csharp-twin-getstarted
Please comment in the below section for further in this matter.