Not able to add new VM in existing domain on VM(i.e. Domain Controller) using Powershell (Please Note: Domain controller VM and New VM need to be in same cloud service and same VNET, also I'm not using affinity group)

Hi,

I have created a VNET, a cloud service and a VM which will act as domain controller using powershell script.
Now I want to add new VM in domain(This VM must be in same cloud service and same VNET) using powershell script, but when I try to execute, this gives warning "VNetName, DnsSettings, DeploymentLabel or DeploymentName Name can only be specified on new deployments." and creates VM, but the VM does not get added in domain.

The issue is- I can create new VM and add it in domain "manually" but failed using powershell script.
the question is if I'm able to do this manually then why is it not possible using powershell script?

Second thing is when I try with same scenario as mentioned above except new VM will be in different cloud service using powershell then it works, but the problem here is domain controller is not able to ping new VM(which is now member of domain) but new VM can ping domain controller.
Did I missed something? please help. Thanks in advance.