> Where can one buy a key?
Don't. Please. The fact that you got denied is a hint that you cannot get a properly licensed Enterprise copy. A key would activate your Windows but not license it. In other words, it's piracy. And you can get a pirated copy for free. Save your money.I'm using the Windows 11 Enterprise IoT LTSC with activation until 2038 right now.
It's not actively usurping Windows security.
In fact, I've read more than once that Microsoft tech support have been known to use massgrave scripts to help with activation-related issues with clients: Although I should caveat that with saying that it may have been Reddit I found that info so pinch of salt and all that...
So, my take on this is if the massgrave scripts allow activation without breaking any laws then sobeit. I'm talking about doing stuff that, while it appears dodgy, actually just manipulates the ultra-complicated processes under the hood that Microsoft has already built into the OS.
It's like publicising the workarounds for the now-mandatory Microsoft account when installing Windows 11. These involve things like reg hacks and commands: they're already in Windows so publicise them all you want imo.