no space for two factor authentication code

Please can you post a screenshot so that I can better understand what you are seeing?

You could use https://snag.gy or any similar service.

That’s not our plugin. We don’t support backup codes by email. (In my view they’re not truly two-factor. Usually people have the same email address for sending WP “forgotten password” and two-factor codes to. So an attacker does not need two things to log in – he only needs one (ability to read your emails)).