Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
OK, I took a look at this other site ...
Sure they say the right things, better than the first one did. Maybe they are better at finding scammers than Amazon (that would be trivially easy), the question remains. Where do the people they front for find keys at these prices? Software is not like a truck load fruit, which does have a very definite "best before" date, after which even I would expect the store to pay ME to haul it away
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So what do they suggest, you spend $6 to buy a "guarantee" from them to help you if your key doesn't' work. Good deal for them. Why should you pay extra if they have already done their job and vetted the suppliers?
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I suggested you search for "reviews" of the sites. I did a quickie search for and found this review
https://techguided.com/is-kinguin-legit-windows-games/
Now, I don't say I trust this reviewer, this is the first time I've seen them. But the idea is to find a reviewer you trust and see what they say.
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As I said before. When dealing with this sort of site, either you get independent confirmation that the site is trustworthy, or you are willing to gamble the price of your purchase that you will get at least a year or two of use out of it...