You might also find your answer in the LastPass Enterprise Manual.
What happens if I lock myself out of my Enterprise using policies I've created?
We recommend that users excercise as much planning and foresight as possible when enabling policies that could lock themselves or other users out. In the case that this happens, Enterprise users who are locked out should contact their Enterprise Admin. Enterprise Admins that get locked out can contact LastPass support through the ticketing system found to the right of this page.