Microsoft tech support seems reluctant to do anything for 7 users because of end of support.
But you will have to contact them as no one here in the 7 forums works for Microsoft, Microsoft doesn't look and these 7 forums and we can't activate it for you.
It's not just date and time.
https://support.microsoft.com/en-au/help/10738/windows-10-get-help-with-activation-errors
Applies to: Windows 10Windows 7Windows 8.1
| 0x80072F8F | You might see this error if the date and time for the PC is incorrect, or Windows has trouble connecting to the online activation service and can't verify your product key.To verify date and time, select the Start button, then select Settings > Time & language > Date & time.To check your Internet connection:<ol><li><p>Type <strong>network troubleshooter </strong>in the search box on the taskbar, then select <strong>Identify and repair network problems</strong>.</p></li><li><p>Follow the instructions to fix any problems with the network.</p></li></ol>If the network troubleshooter didn't find any problems with your network connection, try restarting your PC to see if that fixes the problem. |
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If that is not it:
Contact Microsoft:
Activate Windows 7 or Windows 8.1 - Windows Help - Microsoft Support
When you begin activation, Windows will try to use your Internet connection to activate online. If you have problems activating online, you can activate using the phone.
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If you have to use Phone Activation, read this detailed information about using that method:
"How to Activate Windows 7 by Phone"
http://www.sevenforums.com/tutorials/18715-activate-windows-7-phone.html
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If you have problems using that method contact Microsoft Support:
To contact Microsoft Support:
What can we help you with?
https://support.microsoft.com/en-us
Contact support