About Windows Activation

[Windows 10]

Hello,Am just writing as I'm having difficulties activating my Windows.I recently just got my old Desktop Computer updated from Windows 7 to 10, unfortunately my desktop cannot run Windows 11 otherwise I'd go to 11. The tech shop I went to who did the update and said that the product key for my desktop would work, however, it just keeps saying I haven't got an invalid license.On the Activation screen in settings, it shows a error message to a product key (different from my desktop one). It says:"The last product key (ID: Insert Number) you entered can't be used on this copy of Windows (0x803fa

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