Also having this issue

and for after 2 or 3 monthes on? Then youre too EARLY-a very common error.

OR did you use trenitlaia/app? its NOT possible to book directly online-if you had spent a few mins reading the full info on REServ it would have been clear.

sebastian seewulf has made an alernative overview-thee is also the sneeky workaorund by using oebb.at=austrian rials.

Note that for many sectors people worry toomcu about its perfectly possible to se lcoal/regionel trains without any need.

Thanks for the response. Unfortunately, it is not an issue of being too early. All trains within Italy (including those within the next 90 days) are showing as fully booked/unavailable on the reservation site. It appears to be an issue within the system.

Just forget the Interrail/Eurail website for day trains in Italy. It's easier and cheaper to book via ÖBB. Do NOT use "Seat only” but add the "Interrail / Eurail” discount to each person and then look for normal tickets.