In VM workstation, I have a Windows Server 2012 with STD edition named : STD2012
I created a snapshot and use that snapshot to create 3 VMs. However, I selected linked clone instead of full cloned.
VM1 is now DC. When i tried to join VM2 and Vm3 to the domain, I was not able to do so because the system reported that SID is not unique.
So, I downloaded PSGETSID on my VM and used it to check SID (just to confirm that SID of VM1, VM2 and VM3 is same).
Then i used sysprep command on VM that automatically change the SID of VM.
%windir%\system32\sysprep\sysprep.exe