Join a Azure VM into a Multiple Active Directory Domains deployment

Currently using the Azure to deploy a multiple active directory deployment. A VNET has been created with the DNS server set to point to the 1st AD domain's DNS server. I have since deployment 3 AD domain (domain controller), each with its own DNS server, en each domain occupy its own subnet.

I use the following code to try to creat a VM and let it join to one specific domain automatically, but it does not work

$DNSServer = New-AzureDNS -Name "SubnetDNS" -IPAddress $DNSIP
   
    New-AzureVMConfig -Name $MemberServerName -InstanceSize $MemberVMSize -ImageName $image.ImageName | `
                    Add-AzureProvisioningConfig -WindowsDomain  -JoinDomain $DomainFqdn `
                        -AdminUsername $VMuserName -Password $VMpassword `
                        -Domain $DomainName -DomainUserName $DomainAdminUser -DomainPassword $DomainAdminPassword   | `
                    Set-AzureSubnet -SubnetNames $subnetName | `
                    New-AzureVM -ServiceName $ServiceName -DNSSettings $DNSServer -WaitForBoot

when i execute the code, i got a warning message saying 

WARNING: VNetName, DnsSettings, DeploymentLabel or DeploymentName Name can only be specified on new deployments.

I checked the MSDN article, it does not metnion anything like the warning message says.

How can i create a VM and let it join to any AD domain i deployed in the Azure?