Customer is not hosting their DNS in AD as DNS integrated zone. they used 1 of their member server and host the DNS services.
they have remote office that intended to deploy with RODC.
During the AD promote wizard, at the steps for RODC, GC and DNS enable page, there is message saying that can't locate the DNS server because it is using external DNS.
If I click next, the AD promotion can finish successfully.
However, when I launch DNS MMC, I got access denied. the account that I logged in has domain admin right.
I tested the same scenario in my lab, it works with no issue. (in my lab is using AD integrated DNS).
I tried to follow this https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc742490(v=ws.10)
to enlist the DNS, the command returned with access denied as well.