Error: Code=MarketplacePurchaseEligibilityFailed

**Describe the bug**
I ran the command in PS

` New-AzResourceGroupDeployment -ResourceGroupName "demoresourcegroup" -TemplateUri https://raw.githubusercontent.com/Azure/Azure-Network-Security/master/Lab%20Templates/Lab%20Template%20-%20NetSec%20Demo%20Lab-Standard/AzNetSecdeploy.json -DiagnosticsWorkspaceName "TestWorkspaceSierac" -DiagnosticsWorkspaceSubscription "123456789-sier-aaaa-xxxx-b826eef6c592" -DiagnosticsWorkspaceResourceGroup "TestResourceGroup" -DDOSProtectionConfiguration $true`

and got the following error

> New-AzResourceGroupDeployment: 12:15:59 - Error: Code=MarketplacePurchaseEligibilityFailed; Message=Marketplace purchase eligibilty check returned errors. See inner errors for details.
> New-AzResourceGroupDeployment: The deployment validation failed

Thanks for your help
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