Windows Server 2016 RS3 can no longer be added as an Active Directory domain controller (DC) to an existing domain that is still using File Replication Service (FRS) for replication of the SYSVOL share.
The server being promoted does not support FRS and cannot be promoted as a replica into the specified domain.
You MUST migrate the specified domain to use DFS Replication using the DFSRMIG command before continuing.
For more information, see https://go.microsoft.com/fwlink/?linkid=849270.
The replacement for FRS is the Distributed File System Replication (DFSR). To work around this issue, migrate the existing domain to DFSR replication. The following articles describe in more detail how to make this change:
Article ID: 4025991 - Last Review: 19 Jun 2017 - Revision: 5