DNS integration
The Netlogon service registers all SRV resource records for the domain controller. These records appear in the DNS server's forward query area in your domain name in the _msdcs, _sites, _tcp, and _udp folders. Other computers use these records to query information about the domain's Active Directory.
We can test it and remove the scope
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Client failed to add domain
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and re-establish a scope
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Restart the Netlogon service
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New scopes re-establish folders such as _sites, _tcp, etc.
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Clients are also able to add domains properly
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This article from "Johnlu Microsoft technology Blog" blog, declined reprint!
Learning summary-active Directory Domain Services Management 09-dns Integration