Zone transfer is on our roadmap however not planned for CY 2019.
-Rohin KKevin Bell commented
I want to use Azure as a reliable secondary DNS server. I do *not* want Azure DNS servers as my primary DNS, because I want to control and modify my .DOM files directly, load them to a local DNS server that I can lay hands on, and easily update my Azure DNS server with that modified .DOM file. I do *not* want the Azure SOA record insisting that it is authoritative, especially if that DNS zone is on an IP address that could change at any time.
I like the idea of Azure DNS. I do not like surrendering control of my domain to it. At this point, my only alternative if I want to use Azure is to spin up a dedicated Azure AM that only does DNS queries.