Merge pull request #276510 from mbifeld/docs-editor/ephemeral-1716923659

Add pre-reqs section to New UI doc

Author: v-dirichards

articles/cloud-shell/get-started/ephemeral.md

@@ -13,24 +13,41 @@ sessions don't require a storage account. When your Cloud Shell session ends, wh
 after the window is closed or when Cloud Shell is restarted, all files you saved are deleted and
 don't persist across sessions.
 
+## Prerequisites
+
+Before you can use Azure Cloud Shell, you must register the **Microsoft.CloudShell** resource 
+provider. Access to resources is enabled through provider namespaces that must be registered in your 
+subscription. You only need to register the namespace once per subscription.
+
+To see all resource providers, and the registration status for your subscription:
+
+1. Sign in to the [Azure portal][04].
+1. On the Azure portal menu, search for **Subscriptions**. Select it from the available options.
+1. Select the subscription you want to view.
+1. On the left menu, under **Settings**, select **Resource providers**.
+1. In the search box, enter `cloudshell` to search for the resource provider.
+1. Select the **Microsoft.CloudShell** resource provider register from the provider list.
+1. Select **Register** to change the status from **unregistered** to **Registered**.
+
+   ![Screenshot of selecting resource providers in the Azure portal.][09]
+   
 ## Start Cloud Shell
 
 1. Sign into the [Azure portal][04].
 1. Launch **Cloud Shell** from the top navigation of the Azure portal.
 
    ![Screenshot showing how to start Azure Cloud Shell in the Azure portal.][07]
-
+   
 1. The first time you start Cloud Shell you're prompted to which shell to use. Select **Bash** or
    **PowerShell**.
 
    ![Screenshot showing the prompt to select the shell.][05]
-
+   
 1. In the **Getting started** pane, select **No storage account required** for an ephemeral session.
    Using the dropdown menu, select the subscription you want to use for Cloud Shell, then select
    the **Apply** button.
 
    ![Screenshot showing the select subscription and optional storage prompt.][06]
-
 ### Set your subscription
 
 1. List subscriptions you have access to.
@@ -120,3 +137,4 @@ Get-AzCommand
 [06]: media/ephemeral/getting-started.png
 [07]: media/ephemeral/shell-icon.png
 [08]: ../persisting-shell-storage.md
+[09]: media/ephemeral/resource-provider.png