Hello @Latha Thanks for reaching out to us!
Few Troubleshooting Steps:
1) Have you verified that all the LogicApp runs history ?
2) Please verify if you have selected the event type in the IoTHub events settings?
3) Check if you are able to see the connected & disconnected states for the Device Twin is getting changed?
We have verified the Document and were not able to repro the issue, as below images show the successful email alerts for Connected and Disconnected events.
The schema for DeviceConnected and DeviceDisconnected events have the same structure. This sample event shows the schema of an event raised when a device is connected to an IoT hub:
Verification from our side:
Email Alerts to my Inbox:
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