Active Directory does not exist or cannot be contacted [CannotAccessAD]
Microsoft Exchange Server 2016 Setup can't continue because it can't contact a valid Active Directory directory service site. Setup requires that the server you're installing Exchange on is able to locate the configuration naming context in Active Directory.
To resolve this issue, verify that the user account running Exchange Setup is an Active Directory user and then run Setup again. If this doesn't resolve the issue, follow the guidance about using the dcdiag.exe and repadmin.exe support tools from the topics below to further diagnose the problem.
For more information about Active Directory troubleshooting and configuration for Exchange, see the following topics:
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