Concerning the ticket vending machines, there are also some machines that don't accept ICOCA, such as the vending machines of JR East installed at Shinjuku Station's Keio gate, and sometimes such a remark isn't made for those machines.
また、券売機でも新宿駅京王口にあるJR東日本の券売機など利用できないものがあり、利用できない券売機でもその旨の注記がない場合がある。