These cheap keys might work but there is no way they are legitimate. No matter what some ( non-Microsoft ) tool you downloaded might say.
The process I used to activate office (2016 and 2019), when using the keys from i-Tech is to login using my main Microsoft account at setup.office.com (this is a Microsoft domain because after I logged in I had access to all the Microsoft services that I am entitled to). After this I was asked to to enter the product key. I then downloaded a customised (with the product key embedded), setup stub which started the whole office download and installation process.
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and he gave me 2 free 

