renamed page/ Added subsection

Author: vpattnai

defender-xdr/teams-restrictions-dexapp.md

@@ -15,15 +15,17 @@ ms.collection:
   - essentials-manage
 ms.topic: conceptual
 search.appverid: met150
-ms.date: 05/15/2024
+ms.date: 06/27/2024
 ---
 
-# Troubleshooting Microsoft Defender Experts app permissions in Microsoft Teams
+# Troubleshooting issues with Microsoft Defender Experts app in Microsoft Teams
 
 **Applies to:**
 
 - [Microsoft Defender XDR](microsoft-365-defender.md)
 
+## App policy permissions
+
 The Microsoft Defender Experts app is available for Microsoft Teams by default, but some environments might have limitations that block the app's installation because of app policy permissions in Teams. [Learn how to check Teams app permissions policies](#check-the-teams-app-permission-policies)
 
 :::image type="content" source="/defender-xdr/media/teams-communication-issues.png" alt-text="Screenshot of Teams communication restrictions." lightbox="media/teams-communication-issues.png":::
@@ -88,6 +90,10 @@ The app should start working after 24 hours.
 
 3. Complete the rest of the fields as needed then select **Save**. If this policy is for a group of users, make sure that all the members in the channel are assigned to the policy. The app should start working after 24 hours.
 
+### Teams channel unavailable
+
+You will not be able to receive updates or chat with Defender Experts if the Managed Response channel is archived or deleted. To learn more, see how to [unarchive](https://support.microsoft.com/office/archive-or-restore-a-channel-53c46491-a265-4391-a2a7-001c5026c9e5) or [restore a deleted channel](https://support.microsoft.com/office/delete-a-channel-in-microsoft-teams-973f9014-53db-4165-8ab4-365021fe36b7) back.
+
 ### See also
 
 - [Communicating with Defender Experts for XDR](communicate-defender-experts-xdr.md)