The parts where it tells you to wait for X minutes, the teensy doesn't become idle, it keeps typing the codes regardless of that, meaning that it would be missing out codes.
I'm pretty sure Orvatech designed it for the EFI, not for iCloud, you will have better luck with that as there's no timeouts or anything.
Just let it do it's thing, once it's complete, delete all partitions and re-install the OS, let us know your results!
Also I think you plug in the Teensy once it asks you for the code, not before otherwise it will miss out codes like it did.