Windows 10: Bought anew copy of Windows 10 Home and now it's telling me the Product Key is invalid

I purchased a new copy of Windows 10 Home a few days ago and did a fresh install on my desktop. After installing everything seemed right, including me no longer having the "Activate Windows" Message on the bottom right of my main monitor. Today, however, I boot up to find that the message has returned, and my system is no longer activated. I tried re-entering my product key and using the "wmic path SoftwareLicensingService get OA3xOriginalProductKey" command which returned nothing but "OA3xOriginalProductKey" on the following line. I have tried all but re-installing windows to try and re-activate it.

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Upgraded from windows 8.1 and have an invalid product key and liscense

As the title suggests I reserved my free copy of windows 10 from 8.1, but my windows 10 key isn't valid as it seems... I get the error code: 0xC004F034. Which tells me in the error description that my product key either doesn't exist or is invalid. Like
i've said that's weird because i upgraded from a legit copy of windows 8.1. this "invalid" product key also prohibits me from downloading apps in the store. Please help.

 

Invalid Product Key

I bought my computer from Best Buy with Windows 10 preinstalled. Now I am upgrading Windows 10 and I get an invalid product key error. Why?

 

Invalid Product Key

My system crashed and then when it came back on it required my Product Key, I entered the correct key and it tells me its invalid. I have Windows Vista but now its trying to tell me its not supported and I have to upgrade to Windows 10