So, if i get it right, your main problem is you can't find where is email from yobit which contained the code while you want to login?
Have you checked your spam box? Sometimes, it goes to there if you can't find it in your inbox mail.
Secondly,evertime I try to login,Yobit send me two emails with the same detail just to tell me login from a new address,without the GA code.That prove I can get the email send from Yobit.So I do not know why I can not find the GA code they said theg had send to me .
This makes me confused, why you get 2 emails from yobit?