If a user is willing to press the button, a PIN isn't going to stop them. Your app is decreasing security in favor of usability, which is not something look for when they are looking to implement two factor auth.
I think anyone who would blindly use your proprietary two factor solution that makes it easier for end users to authorize other people to log in would be silly.
I think anyone who would blindly use your proprietary two factor solution that makes it easier for end users to authorize other people to log in would be silly.