add newly VMSS to existing backendpool of ApplicationGateway in Azure ARM - azure-resource-manager

Question

As I am new to Azure ARM template, I would like to add newly created VMSS to existing backendpool of ApplicationGateway in Azure ARM; I am following this official link Add VMSS in backendpool of ApplicationGateway
but while doing that I am getting this below error:
New-AzResourceGroupDeployment : 07:17:14 PM - The deployment
'Test-APP' failed with error(s). Showing 1 out of 1 error(s).
Status Message: Cannot parse the request. (Code: InvalidRequestFormat)
Could not find member 'ApplicationGatewayBackendAddressPools' on object of type 'VMScaleSetNetworkInterfaceIPConfiguration'. Path
'Properties.UpdateGroups[0].NetworkProfile.networkI
nterfaceConfigurations[0].properties.ipConfigurations[0].ApplicationGatewayBackendAddressPools',
line 1, position 671. (Code:InvalidJson) CorrelationId:
1234576-7tt2-49r1-b4d4-517b345691aa At line:8 char:1
New-AzResourceGroupDeployment `
+ CategoryInfo : NotSpecified: (:) [New-AzResourceGroupDeployment], Exception
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.ResourceManager.Cmdlets.Implementation.NewAzu
reResourceGroupDeploymentCmdlet
Any update on this will be highly appreciated.

Answer 1

You can use the below cmdlet's to add the new VMSS as backend address pool for existing application gateway using either PowerShell or Azure CLI.
Power shell cmdlet to add new VMSS as backend pool :
Add-AzApplicationGatewayBackendAddressPool
-ApplicationGateway <PSApplicationGateway>
-Name <String>
[-BackendIPAddresses <String[]>]
[-BackendFqdns <String[]>]
[-DefaultProfile <IAzureContextContainer>]
[-WhatIf]
[-Confirm]
[<CommonParameters>]
Here is the reference document for the above power shell command
Azure CLI to add new VMSS as backend pool :
az network application-gateway address-pool create --gateway-name
--name
--resource-group
[--no-wait]
[--servers]
[--subscription]
Here is the reference document for the above AzureCLI command