Hello @LEELADHAR LADIA Thanks for asking this helpful question on this forum!
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What are the challenges if many devices are registered with Azure IoT DPS as Individual enrollment?
I would recommend visiting this page Troubleshooting with Azure IoT Hub Device Provisioning Service
The following page lists the limits that apply to Azure IoT Hub Device Provisioning Service resources.
- Add Individual Enrollment: This allows enrolling one device at a time that allows unique configuration per device.
- Group Enrollment allows enrolling the group of devices at a time that allows common configuration for a group of devices.