Hi12 windows 10 activation key

I have upgraded from windows 7 to windows 10. I tried to activate the windows and it failed. what is the activation key?

serial number is Q6445160502674

Have you tried using your Windows 7 activation key? That might work.

I did try windows 7 key and it still not workinf. Any idea how to activate windows 10?

Did you upgrade Windows 7 to Windows 10 with the same version? (Home or Pro)

yes, I am upgrade same version (Home).