Erasmus students are allowed to take exams online during Winter session.
The procedure is detailed at the following link https://www.unipi.it/images/
When registering for the exam on the Valutami Portal you can specify that you need to take it remotely.
If you have already registered for the exam(s) and the registration deadline for such exam(s) has already expired, you can submit your request from here by accessing with your UNIPI credentials (the form is also available in English).
The request will be automatically forwarded to the professor through the portal.