Thanks for the clarification.
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bc

Aha, thanks for that. I was not aware of that capability. But why a generic key? Why not my actual pro key?
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bc

That's the thing. The product key I gave it was definitely a pro key. Further, it went through the Home to Pro upgrade. Post upgrade, system control panel identifies the OS as Windows 10 Pro, but...

I’ve got a laptop that came with Windows 8 (non-pro). Back then I bought a Windows 8 pro key and used it to upgrade the laptop to pro.

Flash forward to now. I was in the Windows 10 Insider fast...