Possible to sell extra windows 10 key?

Already have a windows 10 key attached to my Microsoft account from a previous build.

Bought a prebuilt a year ago, came with its own windows 10 key. They emailed me the key as well. Haven't touched it since it'd be pointless.

submitted by /u/TheDynospectrum
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source https://www.reddit.com/r/beermoney/comments/vlcrvc/possible_to_sell_extra_windows_10_key/