Added note similar to that in App Service docs

in reference to situations in which custom location 
features need to be enabled on the cluster
manually in response to feedback item #76695

Author: apwestgarth

articles/container-apps/azure-arc-enable-cluster.md

@@ -6,7 +6,7 @@ author: cebundy
 ms.service: container-apps
 ms.custom: devx-track-azurecli
 ms.topic: tutorial
-ms.date: 3/20/2023
+ms.date: 3/24/2023
 ms.author: v-bcatherine
 ---
 ---
@@ -429,6 +429,10 @@ The [custom location](../azure-arc/kubernetes/custom-locations.md) is an Azure l
 
     ---
 
+    > [!NOTE]
+    > If you experience issues creating a custom location on your cluster, you may need to [enable the custom location feature on your cluster](../azure-arc/kubernetes/custom-locations#enable-custom-locations-on-your-cluster).  This is required if logged into the CLI using a Service Principal or if you are logged in with an Azure Active Directory user with restricted permissions on the cluster resource.
+    >
+
 1. Validate that the custom location is successfully created with the following command. The output should show the `provisioningState` property as `Succeeded`. If not, rerun the command after a minute.
 
     ```azurecli