Update ExtendedLocation validation in NewAzureVirtualNetworkGateway (#21910)

* Fixed NewVNG ExtendedLocation validation

* More fix

* Avoid breaking

Author: myun12580

src/Network/Network/ChangeLog.md

@@ -19,6 +19,7 @@
 --->
 
 ## Upcoming Release
+* Updated `New-AzVirtualNetworkGateway` to remove validation for `ExtendedLocation` parameter
 
 ## Version 6.0.0
 * Added new cmdlets for RouteMap child resource of VirtualHub.

src/Network/Network/VirtualNetworkGateway/NewAzureVirtualNetworkGatewayCommand.cs

@@ -81,9 +81,6 @@ public class NewAzureVirtualNetworkGatewayCommand : VirtualNetworkGatewayBaseCmd
             Mandatory = false,
             ValueFromPipelineByPropertyName = true,
             HelpMessage = "The extended location of this virtual network gateway")]
-        [ValidateSet(
-            "MicrosoftRRDCLab3",
-            IgnoreCase = true)]
         public string ExtendedLocation { get; set; }
 
         [Parameter(
@@ -409,7 +406,7 @@ private PSVirtualNetworkGateway CreateVirtualNetworkGateway()
 
             }
             vnetGateway.GatewayType = this.GatewayType;
-            if(vnetGateway.GatewayType == "LocalGateway")
+            if (vnetGateway.GatewayType == "LocalGateway" || vnetGateway.GatewayType == "ExpressRoute")
             {
                 vnetGateway.ExtendedLocation = new PSExtendedLocation(this.ExtendedLocation);
                 vnetGateway.VNetExtendedLocationResourceId = this.VNetExtendedLocationResourceId;

src/Network/Network/help/New-AzVirtualNetworkGateway.md

@@ -388,7 +388,6 @@ The extended location of this virtual network gateway
 Type: System.String
 Parameter Sets: (All)
 Aliases:
-Accepted values: MicrosoftRRDCLab3
 
 Required: False
 Position: Named