Add Note for device/module identity retrieval delay after creation

Add Note for device/module identity retrieval delay after creation

Author: nimengan

articles/iot-hub/iot-hub-devguide-identity-registry.md

@@ -47,6 +47,9 @@ An IoT Hub identity registry:
 > [!IMPORTANT]
 > Only use the identity registry for device management and provisioning operations. High throughput operations at run time should not depend on performing operations in the identity registry. For example, checking the connection state of a device before sending a command is not a supported pattern. Make sure to check the [throttling rates](iot-hub-devguide-quotas-throttling.md) for the identity registry, and the [device heartbeat](iot-hub-devguide-identity-registry.md#device-heartbeat) pattern.
 
+> [!NOTE]
+> Please expect delay upto 1 second sometimes for device or module identity to be available for retrieval after device or module identity creation.
+
 ## Disable devices
 
 You can disable devices by updating the **status** property of an identity in the identity registry. Typically, you use this property in two scenarios:
@@ -243,4 +246,4 @@ To try out some of the concepts described in this article, see the following IoT
 
 To explore using the IoT Hub Device Provisioning Service to enable zero-touch, just-in-time provisioning, see: 
 
-* [Azure IoT Hub Device Provisioning Service](https://azure.microsoft.com/documentation/services/iot-dps)
+* [Azure IoT Hub Device Provisioning Service](https://azure.microsoft.com/documentation/services/iot-dps)