Uhh... So I have 1.2.0 and XenForo 1.5.9 and all the setup etc works... but functionality doesnt... so when i login on new device, it prompts asking for code... but If i just hit refresh or reload login page then I type same details, it will let me in the account without asking for 2fa auth!! On occasion I tested the 2fa verification itself by typing in code from my Google app and it says it's the wrong code (it's not!). Again, upon reloading to "try again" the 2fa never was prompted. TL;DR - Upon logging in to new device, 2fa does not enforce.