Why dont microsoft accept that theres no postal code for anywhere in ireland except dublin

When I try to enter in my code for Xbox Live Gold Membership it keeps coming up '' Extra Information Is Required To Complete This Transaction'' and it asks me for my billing address twice my city my phone number and my postal code but I live it waterford so there's no postal code and it keeps saying there is someone help
Asked Jan 03, 2013
just enter anything
Answered Feb 08, 2013

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