Update configure-monitoring.md

Author: ggailey777

articles/azure-functions/configure-monitoring.md

@@ -3,7 +3,7 @@ title: Configure monitoring for Azure Functions
 description: Learn how to connect your function app to Application Insights for monitoring and how to configure data collection.
 ms.service: azure-functions
 ms.topic: how-to
-ms.date: 07/05/2024
+ms.date: 07/11/2024
 ms.custom: devdivchpfy22
 
 # Customer intent: As a developer, I want to understand how to configure monitoring for my functions correctly, so I can collect the data that I need.
@@ -293,6 +293,9 @@ For a function app to send data to Application Insights, it needs to connect to
 
 When you create your function app in the [Azure portal](./functions-get-started.md) from the command line by using [Azure Functions Core Tools](./create-first-function-cli-csharp.md) or [Visual Studio Code](./create-first-function-vs-code-csharp.md), Application Insights integration is enabled by default. The Application Insights resource has the same name as your function app, and is created either in the same region or in the nearest region.
 
+>[!NOTE]
+>When using `APPLICATIONINSIGHTS_AUTHENTICATION_STRING` to connect to Application Insights using Microsoft Entra authentication, you should also [Disable local authentication](../azure-monitor/app/azure-ad-authentication.md#disable-local-authentication). This configuration allows you to ingest telemetry authenticated exclusively by Microsoft Entra ID and prevents data access by using API keys.
+
 ### New function app in the portal
 
 To review the Application Insights resource being created, select it to expand the **Application Insights** window. You can change the **New resource name** or select a different **Location** in an [Azure geography](https://azure.microsoft.com/global-infrastructure/geographies/) where you want to store your data.