Circumvent a digital license?

We bought a Dell Inspiron that shipped with Windows 10 Home installed and a digital license. I am trying to get Windows 10 Pro on it so I can join our domain. I've tried entering our legitimate Pro key, and I'm told it isn't valid. Anytime I try a clean install, it, as expected, skips the OS choice and goes right to Home. I have no option to pick.

I'm also struggling to find a Windows 10 Pro (only Pro) .iso.

So, any suggestions on how to get around this? I'd love to wipe the digital license clean, but I believe that's stored on the motherboard.

I ended up finding a solution using an ei.cfg file.

How To Select Pro Edition While Installing Windows 10

I bought a cheap Pro update key and upgraded using Upgrade Product Key under Settings. I had no problems.