Afaik the code should still work, however those codes are also limited to once per device

So if you create a new account it needs to be on a new device (phone, tablet, pc, whatever)

They're once per account, not device. I've got a several accounts on my Mac and have used codes multiple times across accounts. 

Failed😂

i

All that proves is that you have no clue what you're doing. The codes remain limited by time and account, not by device.