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The first step in this procedure is that you register yourself in the 2FA system called DUO. For this, login with your PHYSICS account on the WEB-mail, http://webmail.physics.leidenuniv.nl
You will now be presented a setup procedure. Just follow the instructions and you are all set for two factor authentication.
For the time being this will only work for the webmail in order to let you have some experience with the system.
If you have any questions, contact: Helpdesk@Physics.LeidenUniv.nl