If you’re using a Windows Server 2012 or 2012 R2 server as a Time Server for your organization, you’re better off just doing a clean installation of Windows Server 2016 instead of the in-place upgrade.
According to KB4051628…
After you do an in-place upgrade on the computer to install Windows Server 2016 Version 1607, the computer is no longer advertised as a time server.
There’s actually a pretty easy fix. The upgrade simply doesn’t set a registry value during installation.
Per the same KB article:
Locate the following registry path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer
Set the DWORD value of Enabled to 1.
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