Having trouble booking Italo train tickets with BofA credit card

Could be that you need to talk to BA and let them know you are trying to purchase out of country..happened to me when trying to pay for a car pick-up in Athens from Canada.

Have you tried downloading the app and buying the tickets that way? I don't know this specific app, but that
is what has worked for me on other European rail sites. Good luck!

Definitely call Bank of America and tell them what you're trying to do. It's likely that the transaction is being tagged as fraudulent.

Thanks much for the responses, all! 😊

Solved the problem by booking Trenitalia tickets on Rick Steves by Rail Europe!