Hello,
The best option here is to build a new server from scratch and install a new instance of Adaxes on that new machine. Simply migrating / cloning a virtual machine to a new host can cause issues, especially if the IP address changes.
To provide you more specific assistance and a precise list of steps that you need to perform in order to migrate to a new machine, could specify in more detail what do you mean by "we have two Adaxes hosts that need to be migrate do our new DC"? As far as we understand, now you have 2 Adaxes hosts. What are these hosts? Are these 2 instances of Adaxes service? Or, maybe, these are Adaxes service and Adaxes Web Interface installed on different computers? Also, how do you want to migrate the 2 hosts? Do you want to have everything installed on the same computer or do you want to have 2 hosts after migration is complete? Can you provide more detail?