Second key that I have bought from this site that JUST works first time.
Now my go to site.
Highly recomended.

Installed and worked like a charm. Keep in mind, for those who can't do Windows 11, some MS applications won't work with the Enterprise version, i.e., XBox app.

Excelente. Compré una licencia de windows 10 iot y funcionó perfecto.

I'm skeptical of the reviews on sites like this but I figured I'd leave this for those who want to know. It worked without issues. No phone required. I'll try to remember to update this if it changes.

It actually activates my copy of Windows 10 LTSC 2021 IoT! Recommended.