Login to Azure.
az login
Set key vault subscription.
az account set --subscription <subscription name or ID>
Run this command followed by domain names, optional selector value can be passed. Selector defaults to "primary".
ses-create-domain <domain.co.nz>
ses-create-domain <domain1.co.nz> <domain2.co.nz> <domain3.co.nz>
ses-create-domain <domain.co.nz> -s <selector>