Hi @gspencer welcome to the /e/ forum.
I suggest looking for the Easy Installer log on your PC and perhaps sharing it here. Details here Howto troubleshoot issues with the easy-installer.
It can happen that a brand new Samsung has a locked bootloader for 7 to 14 days, released remotely by Samsung after a period of “normal” use using SIM card and wifi. This is revealed by looking at your Download mode screen and looking for the word prenormal, top left hand side; more info on this here. Know your hardware - Samsung. There should have been notice of this in the packaging of a new phone.
(The format for insertion of images is
 – it looks as if you were trying to adjust it! 
)