2-step verification Help

[Egoist00]

Since many people got hacked, so decided to set-up the 2-step verification to secure my account, but when got it set-up, I wasn't able to connect to the game, I got this error "failed to connect to server 104", tried many times, but it didn't work.  So decided to remove the 2-step verification and it worked again. So my question is what is going on and how can I fix this issue??, thanks.