diff --git a/docs/design/agent-and-add-in-overview.md b/docs/design/agent-and-add-in-overview.md
index 1c6a6b4e5..16f15f280 100644
--- a/docs/design/agent-and-add-in-overview.md
+++ b/docs/design/agent-and-add-in-overview.md
@@ -1,7 +1,7 @@
 ---
 title: Combine Copilot Agents with Office Add-ins (preview)
 description: Get an overview of why and how to combine a Copilot agent with an Office Add-in.
-ms.date: 07/15/2025
+ms.date: 07/30/2025
 ms.topic: overview
 ms.localizationpriority: medium
 ---
@@ -141,6 +141,8 @@ The agent configuration file includes instructions for the agent and specifies o
 }
 ```
 
+[!INCLUDE [Validation warning about missing 'auth' property](../includes/auth-property-warning-note.md)]
+
 The reference documentation for declarative agents is at [Declarative agent schema 1.4 for Microsoft 365 Copilot](/microsoft-365-copilot/extensibility/declarative-agent-manifest-1.4).
 
 ### Copilot API plug-in configuration
diff --git a/docs/develop/agent-and-add-in.md b/docs/develop/agent-and-add-in.md
index a9014a02c..3876eedf1 100644
--- a/docs/develop/agent-and-add-in.md
+++ b/docs/develop/agent-and-add-in.md
@@ -1,7 +1,7 @@
 ---
 title: Add a Copilot agent to an add-in
 description: Learn how to add a Copilot agent to an add-in.
-ms.date: 07/24/2025
+ms.date: 07/30/2025
 ms.topic: how-to
 ms.service: microsoft-365
 ms.localizationpriority: medium
@@ -191,6 +191,8 @@ The runtime object should look similar to the following. There may be other prop
     }
    ```
 
+    [!INCLUDE [Validation warning about missing 'auth' property](../includes/auth-property-warning-note.md)]
+
 1. *Replace the property values with new values that are appropriate for your add-in.* For more information about these properties, see [Declarative agent manifest object](/microsoft-365-copilot/extensibility/declarative-agent-manifest-1.2#declarative-agent-manifest-object).
 
    > [!NOTE]
diff --git a/docs/includes/auth-property-warning-note.md b/docs/includes/auth-property-warning-note.md
new file mode 100644
index 000000000..dd49e8c18
--- /dev/null
+++ b/docs/includes/auth-property-warning-note.md
@@ -0,0 +1,2 @@
+> [!NOTE]
+> You may get a validation error from the plugin JSON that says you need an "auth" property. You should ignore this error. Your agent will work fine without that property.
\ No newline at end of file
diff --git a/docs/quickstarts/agent-and-add-in-quickstart.md b/docs/quickstarts/agent-and-add-in-quickstart.md
index 9866dbcb2..32ef0f6f7 100644
--- a/docs/quickstarts/agent-and-add-in-quickstart.md
+++ b/docs/quickstarts/agent-and-add-in-quickstart.md
@@ -1,7 +1,7 @@
 ---
 title: Build your first add-in as a Copilot skill
 description: Learn how to build a simple Copilot agent that has an Excel add-in as a skill.
-ms.date: 07/24/2025
+ms.date: 07/30/2025
 ms.topic: how-to
 ms.service: microsoft-365
 ms.localizationpriority: high
@@ -166,6 +166,8 @@ Add the agent with the following steps.
     }
    ```
 
+   [!INCLUDE [Validation warning about missing 'auth' property](../includes/auth-property-warning-note.md)]
+
 1. Open the **\src\commands\commands.ts** file and add the following code the end of it.
 
    ```javascript