I am trying to manage branch offices that are not a direct member of the Domain that SCCM Server is (please see the attached diagram). The issue that I face is that the "machine account" of the SCCM Server needs to have access to the System/System Management OU of the Branch.local Domain. Problem is that the Branch Domain does not have a direct trust with the Domain of the SCCM Server. On The SCCM Server, in The Active Directory Forests section, Branch.local has been discovered successfully, via Boundary/Boundary Groups created by Subnets, however the Publishing Status states that the "Active Directory schema not extended", even though I personally extended it myself (on the Branch.local DC). Is there any other way that I can get around this issue and manage these (Branch.local) clients? . Once I get management of them, there are plans to migrate to the "New Domain" but until then I need to solve this issue.

Thanks in advance.
SCCM-Domain-Issue.PNG