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I've lost my Multifactor Authentication, how do I disable it?
Whenever you login with Multifactor Authentication enabled, you are prompted to use your authentication code to login. Underneath the entry field for your code , there is a link entitled:
"If you lost your device, click here to disable authentication."
"I've lost my device."
Clicking this link will send an e-mail to your LastPass account e-mail address (or security e-mail address if you have set one), that will contain a link that will temporarily disable your Authenticator. If you are unable to access your e-mail for some reason, and have lost your Authenticator device, please see https://lastpass.com/support.php?cmd=showfaq&id=6386.