Configure the conditional forwarder
Follow this Microsoft AD article
Assign a Conditional Forwarder for a Domain Name
In the AD DNS Manager -> Create a New Conditional Forwarder, under DNS Domain: Use the domain name AMS supplied to you; for example,
A523434123.amazonaws.com
.Under IP addresses of the master servers: Add the AMS-supplied IP addresses. Make sure there isn’t a connection problem by validating both addresses.
Select Store this conditional forwarder in Active Directory and replicate as follows: All DNS servers in this domain and press OK.