Trenitalia adheres to the Agreement on Journey Continuation (AJC), which has been signed by the main European rail operators. The agreement allows passengers on an international journey that involves a number of successive train connections on services operated by AJC signatories who have missed a connecting train due to the delay or cancellation of the previous train to board the next available train – at no additional cost – operated by the rail company that provides the service stipulated on the unused ticket.
The operators that have agreed to the AJC are: BLS (Switzerland), CD (Czech Republic), CFL (Luxembourg), DB (Germany), DSB (Denmark), MÁV-START (Hungary), NS (The Netherlands), ÖBB (Austria), Renfe (Spain), SJ (Sweden), SBB/CFF/FFS (Switzerland), SNCB/NMBS (Belgium), SNCF (France), SZ (Slovenia), Trenitalia (Italy), ZSSK (Slovakia).
If you miss your connection on an international journey due to the delay or cancellation of the previous train from one of the rail operators who have signed the agreement, you should contact the railway staff present at the station for information and a certificate of delay, or on board the train, in order to be permitted to continue your journey on the next available train (subject to confirmation of seat availability) operated by the rail company that issued the originally purchased ticket.
You are travelling from Munich to Milan, having purchased the following tickets:
If you miss the connection to Milan due to a delay in the train to Verona, you should ask the Deutsche Bahn railway staff to obtain a certification of delay and contact Trenitalia personnel present at the station, so you can continue your journey on the next available Frecciarossa train service direct to Milan.
Further information on the AJC can be found here