add meid_token auth type for AOAI

Author: cloga

articles/machine-learning/prompt-flow/get-started-prompt-flow.md

@@ -36,7 +36,7 @@ If you aren't already connected to AzureOpenAI, select the **Create** button the
 
 :::image type="content" source="./media/get-started-prompt-flow/connection-creation-entry-point.png" alt-text="Screenshot of the connections tab with create highlighted." lightbox = "./media/get-started-prompt-flow/connection-creation-entry-point.png":::
 
-Then a right-hand panel will appear. Here, you'll need to select the subscription and resource name, provide the connection name, API key, API base, API type, and API version before selecting the **Save** button.
+Then a right-hand panel will appear. Here, you'll need to select the subscription and resource name, provide the connection name, API key if auth type equals to api key, API base, API type, and API version before selecting the **Save** button. Prompt flow also support Microsoft Entra Id as auth type for identity based auth for Azure OpenAI resource. Learn more about [How to configure Azure OpenAI Service with managed identities](../../ai-services/openai/how-to/managed-identity.md).
 
 :::image type="content" source="./media/get-started-prompt-flow/azure-openai-connection.png" alt-text="Screenshot of the add Azure OpenAI connections." lightbox = "./media/get-started-prompt-flow/azure-openai-connection.png":::
 

articles/machine-learning/prompt-flow/media/get-started-prompt-flow/connection-creation-entry-point.png

@@ -48,7 +48,15 @@ Set up connections to provisioned resources in prompt flow.
 | Type        | Name     | API key  | API type | API version |
 |-------------|----------|----------|----------|-------------|
 | OpenAI      | Required | Required | -        | -           |
-| Azure OpenAI| Required | Required | Required | Required    |
+| Azure OpenAI - API key| Required | Required | Required | Required    |
+| Azure OpenAI - Microsoft Entra Id| - | Required | Required | Required    |
+
+  > [!TIP]
+  > - To use Microsoft Entra Id auth type for Azure OpenAI connection, you need assign either the Cognitive Services OpenAI User or Cognitive Services OpenAI Contributor role to user or user assigned managed identity.
+  > - Learn more about [how to specify to use user identity to submit flow run](../how-to-create-manage-runtime.md#create-an-automatic-runtime-preview-on-a-flow-page).
+  > - Learn more about [How to configure Azure OpenAI Service with managed identities](../../ai-services/openai/how-to/managed-identity.md).
+
+- 
 
 ## Inputs