I am following the directions from here:

Section: 32.6.4. Configuring DNS forwarding in AD
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/installing_identity_management/installing-trust-between-idm-and-ad_installing-identity-management#configuring-dns-forwarding-in-ad_configuring-dns-and-realm-settings-for-a-trust
  
I get an error message from AD DNS "The server with this IP Address is not 
authoritative for the required zone"

This error makes me think there is a problem with my IdM DNS server.

My setup is AD integrated and a one way trust is established with AD.  I was 
able to create a forwarder from IdM to AD without issue.

My domains:
AD = gsil.mil
IdM = idm.gsil.mil

I have been reading: 
86.1. Supported DNS zone types
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_identity_management/managing-dns-zones-in-idm_configuring-and-managing-idm#adding-a-primary-dns-zone-in-idm-web-ui_managing-dns-zones-in-idm
  
and 
6.1. The two roles of an IdM DNS server
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/working_with_dns_in_identity_management/managing-dns-forwarding-in-idm_working-with-dns-in-identity-management#the-two-roles-of-an-idm-dns-server_managing-dns-forwarding-in-idm
   
as well as several articles on DNS forwarding vs DNS delegation for AD.

This is a step that I was able to make work with no issues in a previous 
setup/installation.

Red Hat documentation states:
86.1 Supported DNS Zone Types
"Forward DNS zones

    From the perspective of IdM, forward DNS zones do not contain any 
authoritative data. In fact, a forward "zone" usually only contains two pieces 
of information: 
    -  A domain name
    - The IP address of a DNS server associated with the domain "


6.1. The two roles of an IdM DNS server
By default, the Berkeley Internet Name Domain (BIND) service integrated with 
IdM acts as both an authoritative and a recursive DNS server:

Authoritative DNS server
When a DNS client queries a name belonging to a DNS zone for which the IdM 
server is authoritative, BIND replies with data contained in the configured 
zone. Authoritative data always takes precedence over any other data. 

I am still having some confusion why this is not working.  Can someone 
enlighten me?
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