It should have auto detected and used the OEM key. I went back over what was posted and I think I see why it wasn't now. Core Connected I do believe is the "With Bing" edition. That has its own set of keys separate form even the SL edition. I'm not sure what install media you use with that? My first guess would have been the Home SL but obviously that didn't work. The regular 10 home/pro ISO would be my next guess? I'll have to do some searching to try and sort that out. If you read through the showkey thread you might get some answers? https://www.tenforums.com/software-ap...7-showkey.html
Forgot to mention, using a key you found on the internet will likely let you install, but will almost certainly fail activation. Microsoft searches for those leaked keys and blacklists them.
Oh well. Let me just install this one and see what happens. I'll be in touch.
Edit: Used the OEM key earlier. Didn't work. Also let me risk this one guess. I think it will be safe to use the keys from Google. The source said that only use it when the installer asks a key but it wouldn't activate windows. My guess is that when Windows connected to the internet to activate it will use the OEM Key.