Merge pull request #112488 from ekpgh/hpc-re-gate

re-add access list requirement

Author: PRMerger6

articles/hpc-cache/hpc-cache-create.md

@@ -18,7 +18,7 @@ Use the Azure portal to create your cache.
 
 ![screenshot of project details page in Azure portal](media/hpc-cache-create-basics.png)
 
-In **Project Details**, select the subscription and resource group that will host the cache.
+In **Project Details**, select the subscription and resource group that will host the cache. Make sure the subscription is on the [access](hpc-cache-prereqs.md#azure-subscription) list.
 
 In **Service Details**, set the cache name and these other attributes:
 

articles/hpc-cache/hpc-cache-overview.md

@@ -59,6 +59,12 @@ The [customer-managed keys feature](customer-keys.md) is supported only in these
 
 Check the [Azure HPC Cache product page](https://azure.microsoft.com/services/hpc-cache) for the latest availability information.
 
+## Service availability
+
+You must request access for each subscription you will use with Azure HPC Cache. This restriction helps ensure service quality.
+
+Request access by filling out [this form](https://aka.ms/onboard-hpc-cache). After your subscription is added to the access list, you can create caches.
+
 ## Next steps
 
 * Read the [Azure HPC Cache product page](https://azure.microsoft.com/services/hpc-cache) to learn more about its capabilities

articles/hpc-cache/hpc-cache-prereqs.md

@@ -16,6 +16,9 @@ Before using the Azure portal to create a new Azure HPC Cache, make sure your en
 
 A paid subscription is recommended.
 
+> [!NOTE]
+> The Azure HPC Cache team must add your subscription to the access list before it can be used to create a cache instance. This procedure helps ensure that each customer gets high-quality responsiveness from their caches. Fill out [this form](https://aka.ms/onboard-hpc-cache) to request access.
+
 ## Network infrastructure
 
 Two network-related prerequisites should be set up before you can use your cache: