Run NET TIME /SETSNTP:uk.pool.ntp.org on your DC. As long as thw windows time service is running on your domain members the rest is done automatically.
Where are you seeing time.windows.com? As long as the Type value under HKLM\System\CurrentControlSet\Services\W32Time\Parameters is set to NT5DS, the NtpServer value (which is where time.windows.com ...
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