Dan:
Thanks for your feedback and help! We appreciate all the help you've given us and our team, and will be using the feedback accordingly :).
We have users verify their COA and Product Key being used (by the diagnostics tool) to make sure that they need or don't need to purchase a new Windows Product Key. Many times someone (other than the owner/user of that computer) may install a non-genuine Product Key onto their computer (like using a VLK) because it is simply "easier". Unfortunately, this is not the correct use of Product Keys.
If Product Keys do not match their COA sticker, then many times the next step is just to change that user's product key to match their COA. If Product Keys *do* match their COA sticker, then the user may be a victim of (high quality) counterfeitting.
Having a user change their product key to match the COA on that specific machine will meet OEM License requirements for certain activation.
I hope this helps,
-Phil Liu