how to configure the “Replicating directory changes” for SharePoint 2013 via AD

How to configure the "Replicating directory changes" for SharePoint 2013 via AD

I can guide you in this matter by providing you with a reference and key points that may help you in your issue.

note that delegation to grant Directory Changes permission on a domain should be done on Root Domain level. The Replicate Directory Changes permission enables the synchronization account to read AD DS objects and to discover AD DS objects that have been changed in the domain. The Grant Replicate Directory Changes permission does not enable an account to create, modify or delete AD DS objects.

Reference:

https://technet.microsoft.com/en-us/library/hh296982.aspx?f=255&MSPPError=-2147217396#RDCdomain