A large number of services offered by Swiss universities and SWITCH now use edu-ID accounts. To connect as an EPFL member to these services, you must have an edu-ID account linked to EPFL. These help pages document how to proceed.
The SWITCH edu-ID account is a user account managed by the SWITCH Foundation and is offered free of charge to anyone who wishes to take part in training courses in Switzerland.
It is therefore quite possible that you have already opened an edu-ID account at another Swiss university. In that case, you do not need to create a new edu-ID account, because each user has a unique edu-id account.
We also invite you to consult the official SWITCH edu-ID documentation.