add reasons collections wont delete

Author: mestew

memdocs/configmgr/core/clients/manage/collections/manage-collections.md

@@ -2,7 +2,7 @@
 title: Manage collections
 titleSuffix: Configuration Manager
 description: Do common collections management tasks in Configuration Manager.
-ms.date: 04/05/2021
+ms.date: 02/17/2022
 ms.prod: configuration-manager
 ms.technology: configmgr-client
 ms.topic: how-to
@@ -108,6 +108,11 @@ Deletes the selected collection. You can also delete all of the resources in the
 
 You can't delete the collections that are built into Configuration Manager. For a list of the built-in collections, see [Introduction to collections](introduction-to-collections.md#built-in-collections).
 
+Collections might also not delete due to dependent collections. When reviewing a dependant collection you want to delete, also ensure that the dependant collection isn't: <!--9708999-->
+- **Used by cloud attach**: For more information, see [Enable cloud attach for Configuration Manager](../../../../cloud-attach/enable.md).
+- **Used for upload to Microsoft Endpoint Manager**: For more information, see [Make Configuration Manager collections available to assign Endpoint security policies](../../../../tenant-attach/endpoint-security-get-started.md#bkmk_collections).
+- **Assigned to user**: For more information, see [Modify the administrative scope of an administrative user](../../../servers/deploy/configure/configure-role-based-administration.md#modify-the-administrative-scope-of-an-administrative-user).
+
 #### Simulate deployment
 
 Opens the **Simulate Application Deployment Wizard**. This wizard lets you test the results of an application deployment without installing or uninstalling the application. For more information, see [How to simulate application deployments](../../../../apps/deploy-use/simulate-application-deployments.md).