What about multiple devices?

Добавляете айпад, перестает работать на телефоне. И наоборот.
When you add your iPad Authenticator stops working on iPhone. If you add your iPhone back it will stop working on iPad. Apparently Google is not aware that someone could have more than just one device in 2017. ??‍♂️

Evgeny__K about Google Authenticator, v3.0.0