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Why can I bypass Google Authenticator to login to the current site my browser is on?
This is happening because you have enabled Offline Access in your Google Authenticator settings.
As with our other multifactor authentication options, you can choose whether to allow LastPass to store an encrypted vault locally so you can login without an internet connection. If you enable offline access, you will be able to login without using your Google Authenticator code in case of a connectivity issue. With some internet configurations (typically wireless connections and waking from sleep), LastPass may log in offline first, before establishing connectivity to your online vault and prompting for your authenticator code. This may cause LastPass to AutoFill any login credentials you have saved in LastPass for the current page you are on. If you wish to disable offline access, you may do so in your account settings.