From 1st of September, all passengers over the age of 12 must meet the requirements for the Italian Green Pass Covid19 in order to board.
All information and FAQs can be found on the official website of the Italian government https://www.dgc.gov.it/web/ and here: https://ec.europa.eu/info/live-work-travel-eu/coronavirus-response/safe-covid-19-vaccines-europeans/eu-digital-covid-certificate_en
Please inform yourself here: https://www.dgc.gov.it/web/
Have your negative test result, proof of recovery or vaccination certificate in digital or paper form together with your ferry ticket and a valid identification document ready when boarding.
The Green Pass Covid19 is mandatory for interregional traffic and is therefore required for embarkation from and to Sardinia, Sicily and Corsica (also for the route Sardinia-Corsica).
For the island of Elba, on the other hand, it is not compulsory.