Is this a debit card issued by your bank which draws on an account in the bank or is this a prepaid debit card that you bought in a local store?
Apple doesn't accept prepaid debit cards as a payment method.
ASC - Late 2012 Mac mini, macOS 10.13.3; Watch, 38 mm AL, watchOS 4.2.2; iPad Air 2 & iPhone 7+, iOS 11.2.5; TV 4th Gen, tvOS 10.2.6; Airport Express