Unable to activate Windows 10, a similar error appears:
User Account Control (UAC) confirmation window does not appear, even if the specific sound was played.
Change UAC settings to Always Notify:
Open the Control Panel.
Right-click on Start menu and choose Control Panel or press Command+R combination on the keyboard and type:
then hit Enter.
Click on User Accounts icon.
NOTE: If your Control Panel looks like this:
Click on User Accounts, then on User Accounts icon one more time.
Click on Change User Account Control settings link.
Move the slider up to Always Notify.
- Close UAC window and try to activate Windows one more time.