ESU key installation done successfully but product activation failed in windows server 2008 / 2008R2
Some troubleshooting steps that you can try are listed below:
Check if the date, time, year in BIOS and on windows are all correct .
Change the media boot install registry key from 1 to 0 .
Make sure that the package is meant for your operating system edition and architecture.
Restart the computer, and then try to install the package again.
Review the update history of the computer to make sure that all the ESU prerequisites have been installed successfully
You can also try some additional troubleshoot from here https://docs.microsoft.com/en-US/troubleshoot/windows-client/windows-7-eos-faq/troubleshoot-extended-security-updates-issues
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