On this forum we have heard recent reports of some US banks not allowing the use of ATM or debit cards outside of their local US area, which was somewhat surprising.
More US banks are tightening debit card controls due to increasing fraud, like requiring PINs and blocking non domestic use altogether (including on line foreign transactions like buying train tickets) unless the bank is contacted to lift this restriction temporarily, sometimes for only specific country use. These restrictions could also affect ATM only cards although those always needed a PIN.
While it has long been necessary to notify credit card issuers of foreign use, it now seems a good reminder to talk foreign use of debit and ATM cards over with the bank before setting out to avoid getting caught short of funds. Banks notify of such changes, but sometimes they can get overlooked