Environtment variable info

Author: AarDavMax

articles/azure-monitor/app/azure-ad-authentication.md

@@ -200,6 +200,38 @@ The following example shows how to configure the Java agent to use a service pri
 
 :::image type="content" source="media/azure-ad-authentication/client-secret-cs.png" alt-text="Screenshot that shows the Client secrets section with the client secret." lightbox="media/azure-ad-authentication/client-secret-cs.png":::
 
+#### Environment variable configuration
+
+The `APPLICATIONINSIGHTS_AUTHENTICATION_STRING` environment variable lets Application Insights authenticate to Azure AD and send telemetry.
+
+   - For system-assigned identity:
+
+       | App setting    | Value    |
+       | -------------- |--------- |
+       | APPLICATIONINSIGHTS_AUTHENTICATION_STRING         | `Authorization=AAD`    |
+
+   - For user-assigned identity:
+
+       | App setting   | Value    |
+       | ------------- | -------- |
+       | APPLICATIONINSIGHTS_AUTHENTICATION_STRING         | `Authorization=AAD;ClientId={Client id of the User-Assigned Identity}`    |
+
+Set the `APPLICATIONINSIGHTS_AUTHENTICATION_STRING` environment variable using this string.
+
+**In Unix/Linux:**
+
+```shell
+export APPLICATIONINSIGHTS_AUTHENTICATION_STRING="Authorization=AAD"
+```
+
+**In Windows:**
+
+```shell
+set APPLICATIONINSIGHTS_AUTHENTICATION_STRING="Authorization=AAD"
+```
+
+After setting it, restart your application. It now sends telemetry to Application Insights using Azure AD authentication.
+
 ### [Python](#tab/python)
 
 > [!NOTE]
@@ -414,30 +446,6 @@ _InstrumentationKey={profile.InstrumentationKey};IngestionEndpoint={ingestionEnd
 
 The audience parameter, AADAudience, may vary depending on your specific environment.
 
-### Environment variable configuration
-
-The `APPLICATIONINSIGHTS_AUTHENTICATION_STRING` environment variable specifies the Azure AD authentication string for Azure Application Insights. It lets Application Insights authenticate to Azure AD and send telemetry.
-
-Example connection string with Azure AD authentication:
-
-`InstrumentationKey=00000000-0000-0000-0000-000000000000;AuthenticationType=AzureAD;`
-
-Set the `APPLICATIONINSIGHTS_AUTHENTICATION_STRING` environment variable using this string.
-
-**In Unix/Linux:**
-
-```shell
-export APPLICATIONINSIGHTS_AUTHENTICATION_STRING="InstrumentationKey=00000000-0000-0000-0000-000000000000;AuthenticationType=AzureAD;"
-```
-
-**In Windows:**
-
-```shell
-set APPLICATIONINSIGHTS_AUTHENTICATION_STRING="InstrumentationKey=00000000-0000-0000-0000-000000000000;AuthenticationType=AzureAD;"
-```
-
-After setting it, restart your application. It now sends telemetry to Application Insights using Azure AD authentication.
-
 ## Troubleshooting
 
 This section provides distinct troubleshooting scenarios and steps that you can take to resolve an issue before you raise a support ticket.