99% of the time not what is being flogged on local marketplaces, the deals sold bundled with pc's are legit though.
They are typically volume, Msdn or Edu licenses which cannot be resold. You'll known its an Edu license because the reseller will supply login info for the Office account with an email address from an official educational institute, when you see that you know 100% guaranteed you have been scammed.
Volume licenses are not for resell.
All these dodgy licenses will typically activate one way of the other but once Ms works out they aren't being used according to the license agreement they get blacklisted.
Anyone that buys a dodgy Office or Win 7/10 license just install a PID checker, it will tell you what type of license it is, Msdn/Volume /Edu/Oem/Retail. Retail being 100% legit and Oem borderline but probably passable.
Thanks, will try the PID checker next time I’m there