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Add warning not to disable local auth #128399

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3 changes: 3 additions & 0 deletions articles/iot-hub-device-update/device-update-resources.md
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Expand Up @@ -27,6 +27,9 @@ updates and deployments associated with a specific IoT hub. Device Update uses I

In order for Device Update to receive change notifications from IoT Hub, Device Update integrates with the built-in Event Hubs. The IoT Hub will be configured automatically as part of the resource creation process with the required message routes, consumer groups, and access policy required to communicate with IoT devices.

> [!NOTE]
> Do not disable local authentication on the IoT Hub. Device Update requires local authentication to be enabled.
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Copilot AI Apr 13, 2026

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The note explains the requirement but doesn’t direct readers to where the setting is or what will break if they disable it. Consider adding a brief pointer to the relevant IoT Hub setting (e.g., in Azure portal/Twin/CLI) and a short consequence statement (for example, Device Update service-to-hub integration or change-notification ingestion fails), so readers can act on the guidance.

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> Do not disable local authentication on the IoT Hub. Device Update requires local authentication to be enabled.
> Do not disable **local authentication** on the linked IoT hub. In the Azure portal, check the IoT hub authentication settings and make sure local authentication remains enabled. Device Update requires local authentication for its service-to-hub integration; if you disable it, Device Update can fail to ingest IoT Hub change notifications and related Device Update operations may stop working.

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### Message Routing

The following Message Routes are automatically configured in your linked IoT hub to enable Device Update:
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