I eventually got to success by attempting starting with a totally new flash drive. By totally new, I mean I got flash drive, formatted it and then installed a demo version of the UnRaid. Much to my surprise, it worked immediately with the new hardware.
After a bit more exploration I discovered that my old flashdrive was running an older version of UnRaid. Once I updated it to a newer version, everything ran just fine.
To any future readers, Please learn from my failure, just update the UnRaid OS.