Our recent experience with using the Trenitalia app is that for nonregional trains (with NO reserved seats) is that you have to check in using the app before you board to validate the e tickets, but for the high-speed trains (with reserved seating) there is no need to validate the e tickets before your trip since they can't be reused by someone.
Fantastic country, fantastic trains , fantastic food and much more ,what you want more?!!
Thank you for that valuable information and update!
Our recent experience with using the Trenitalia app is that for nonregional trains (with NO reserved seats) is that you have to check in using the app before you board to validate the e tickets, but for the high-speed trains (with reserved seating) there is no need to validate the e tickets before your trip since they can't be reused by someone.