Hello @Michael Liben ,
Thank you for the information provided, the success factors integration does allow to sync to multiple on-premises domains, the information on the specific multiple-forest topologies supported can be found on this link: https://video2.skills-academy.com/en-us/azure/active-directory/app-provisioning/plan-cloud-hr-provision#single-cloud-hr-app-tenant---target-single-or-multiple-active-directory-child-domains-in-a-trusted-forest
For disjointed domains you can configure separate provisioning agent groups for each specific forest. As shown below:
Another option is to configure separate apps to provision distinct user sets from Cloud HR to multiple on-premises Active Directory domains:
Please let me know if the document provided includes the topology you're interested in and I'll gladly assist reviewing other questions you may have.
-Jessie