How do I find my product key for Windows 8.1?

My computer was pre-installed by Dell with Windows 8. I upgraded to 8.1. I have a USB drive from Dell with Windows 8. I clicked "Add Features to Windows 8.1" in control panel, but it asks for my product key. How do I find out my current product key?

I tried this answer

And got a key

But it didn't work in Control Panel

7 Sorted by: Reset to default

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