Unresolved RID 526 and 527 After ADPrep
After preparing AD and installing the first Windows Server 2019 DC into an existing AD environment, it was noted that there were unresolved SIDs listed at the root of the domain. This was corelated to the AD 2019 upgrade as permissions had been audited and cleaned up prior due to previous issues in the environment. Previously all DCs were Windows Server 2012 R2 with all updates installed.
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