Product activation key

T

Thinkhome pc

Hi There,I have recently purchased an old PC (workstation) from my office thru auction. It has a product key sticker of windows 7 pro OA.I have mistakenly installed the windows 10 home without activation/product key. When I tried to upgrade to windows 10pro thru Microsoft store it asked to enter product key appears an error message as shown below, My question is, did anyone else is already using this product key?If yes, How I can retrieve my key? since I'm owning the PC nowWhat can I do next? Kindly help me on this.

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