Need to check whether the product is activated or not

For this, you should contact customer service directly. This can be done by phone; they are available 24/7 at 030-751 51 55. You may also try to contact them by chat (click the link Chat with NS on this page) or by sending a message on Twitter or Facebook.

Note that the message on the displays when checking in our out will always say ‘Reizen op Rekening Trein’, even if a subscription is active. That's normal behaviour, because the subscription itself is not on the card, just the general NS Flex product. This allows for changing your subscription without having to confirm the change at a ticket machine.