Merge pull request #290889 from seligj95/patch-1

Add addressPrefix: <string> requirement

Author: prmerger-automator[bot]

articles/app-service/environment/networking.md

@@ -16,7 +16,11 @@ App Service Environment is a single-tenant deployment of Azure App Service that
 
 ## Subnet requirements
 
-You must delegate the subnet to `Microsoft.Web/hostingEnvironments`, and the subnet must be empty.
+The following are the minimum set of requirements for the subnet your App Service Environment is in.
+
+- The subnet must be delegated to `Microsoft.Web/hostingEnvironments`.
+- The subnet must be empty.
+- The subnet's `addressPrefix` property must be formatted as a string, not an array. 
 
 The size of the subnet can affect the scaling limits of the App Service plan instances within the App Service Environment. For production scale, we recommend a `/24` address space (256 addresses) for your subnet. If you plan to scale near max capacity of 200 instances in our App Service Environment and you plan frequent up/down scale operations, we recommend a `/23` address space (512 addresses) for your subnet.