Set-AzureStaticVNetIP not working. Other VMs assigned reserved IP

I've got a simple vnet set up with a domain controller in it. Everything left to default in the VNET setup. I used Set-AzureStaticVNetIP to set the DCs ip to 10.0.0.4

but if I bring up any other VMs first they get the 10.0.0.4 IP.

The only effect is that the DC now fails to start.

What's the point of using the cmdlet to set the IP when I still need to start the VMs in a specific order anyway? or have I done something wrong?

thanks

Jakub @ Melbourne, Australia Blog