Yay, that worked for me, although I never set up the two-step authentication. But, I used the recovery code I received when I first set up Prey on my devices, then was able to log in using my password and recovery code through "Lost your mobile device".
So, if I don't set up 2FA, I'll have to use this method every time to log into the control panel, then, since I won't ever have a 6-digit code, correct? I did receive a new recovery code via e-mail when I logged in. If so, that seems strange; why do I need a 6-digit code to log in when I don't have 2FA activated?