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Original text from Table 21.2 "Ports required fo an AD trust": 
 Endpoint mapper listener range
1024-1300
TCP 

-----------------------------------

We have heard from a customer:

Dynamic RPC Ports ****
49152-65535
tcp

(**** The range matches the port range used by Windows Server 2008 and later. Samba versions before 4.7 used the TCP ports 1024 to 1300 instead. To manually set the port range in Samba 4.7 and later, set the rpc server port parameter in your smb.conf file. For details, see the parameter description in the smb.conf(5) man page.)

https://wiki.samba.org/index.php/Samba_AD_DC_Port_Usage

Because the Samba version provided within IDM has been updated since 7.x (and for sure with RHEL8 (I've seen that the "error" has been listed) and should be updated on the page describing the ports.

Reported by: jvilicic

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#annotations:f480786a-cb7f-4ebd-8bb2-95faadb9806f