Merge pull request #87775 from hongzli/patch-3

Change "identity" property to be optional

Author: ktoliver

articles/logic-apps/logic-apps-securing-a-logic-app.md

@@ -1176,7 +1176,7 @@ When the [managed identity](../active-directory/managed-identities-azure-resourc
    | Property (designer) | Property (JSON) | Required | Value | Description |
    |---------------------|-----------------|----------|-------|-------------|
    | **Authentication** | `type` | Yes | **Managed Identity** <br>or <br>`ManagedServiceIdentity` | The authentication type to use |
-   | **Managed Identity** | `identity` | Yes | * **System Assigned Managed Identity** <br>or <br>`SystemAssigned` <p><p>* <*user-assigned-identity-ID*> | The managed identity to use |
+   | **Managed Identity** | `identity` | No | <*user-assigned-identity-ID*> | The user-assigned managed identity to use. **Note**: Don't include this property when using the system-assigned managed identity. |
    | **Audience** | `audience` | Yes | <*target-resource-ID*> | The resource ID for the target resource that you want to access. <p>For example, `https://storage.azure.com/` makes the [access tokens](../active-directory/develop/access-tokens.md) for authentication valid for all storage accounts. However, you can also specify a root service URL, such as `https://fabrikamstorageaccount.blob.core.windows.net` for a specific storage account. <p>**Note**: The **Audience** property might be hidden in some triggers or actions. To make this property visible, in the trigger or action, open the **Add new parameter** list, and select **Audience**. <p><p>**Important**: Make sure that this target resource ID *exactly matches* the value that Azure AD expects, including any required trailing slashes. So, the `https://storage.azure.com/` resource ID for all Azure Blob Storage accounts requires a trailing slash. However, the resource ID for a specific storage account doesn't require a trailing slash. To find these resource IDs, see [Azure services that support Azure AD](../active-directory/managed-identities-azure-resources/services-support-managed-identities.md#azure-services-that-support-azure-ad-authentication). |
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