Why did you still trading on Yobit they are already a known scam and have very bad support.
Well, if you already contacted them wait for weeks I believe they still respond but you will wait for many weeks before they reply to your tickets.
more than 3 years ago when I used yobit, I had a problem with the login, so I sent a ticket to support, unbelievable that they didn't respond, days went by and nothing, weeks went by and nothing, until 3 months later I received the message from support saying that my problem has been resolved. i was shocked, i already knew they never responded to tickets, but i was shocked that they responded to me 3 months later when my issue was resolved the same day i sent the support ticket, it was a mistake i was making typing the password and I managed to solve the problem myself
Actually, 3 months is too much but I have also login issue before but it was resolved in 2 weeks they said that they detected a suspicious login using my email and detects many wrong passwords. That is why their system automatically lock my account for security reason so I think this is the reason for other people or him that is why he is getting an error when trying to login with 2FA.
There is nothing we can do right now if Yobit is totally a scam they won't respond even in a month or so. Only support can help with this kind of issue but expect for months to get a reply from their support.