$vmssid = (Get-AzureRMADServicePrincipal -DisplayName "$_scaleSetName").Id

if(!$vmssid){
    Write-Error 'Scale set did not exiset or was not a scale set'
    return 1
}

$groupId = (Get-AzureRMAdGroup -AzureRmContext $AzureContext -DisplayName "$webAppGroupName" ).Id
if(!$groupId){
    Write-Error 'Group not found'
    return 1
}

$shouldAddMember = !(Get-AzureRMAdGroupMember -AzureRmContext $AzureContext -GroupObjectId $groupId | ?{$_.Id-eq $vmssid})
if($shouldAddMember ){
 Add-AzureRmAdGroupMember -AzureRmContext $AzureContext -MemberObjectId $vmssId -TargetGroupObjectId $groupId
}
else{
Write-Output 'Member existed in group'
exit 0
}