You may not have inserted your card properly in the e.dentifier. There might also be dirt in the slot of the e.dentifier. Try blowing it to clear it. You can also try carefully wiping the chip on your card clean. If none of this helps, there is most likely a problem with your card. You can have the card checked at an ABN AMRO branch or apply for a replacement card directly.
If you have applied for a replacement card, your old card will stop working as soon as you activate the new (replacement) card.
If you want to be able to continue using your old card whilst waiting for your new card to be delivered, you can specify this when applying in a branch or by calling Client Service.