Hello John,
I have done some investigating into this, and it turns out that your PostCode is an EIRCode. Unfortunately, at this time, we are still working on offering support for EIRCode lookups for Ireland.
It is a future feature for the Ireland geocoder, and we are in the process of getting the unique data and supporting software infrastructure in place.
I will keep you posted when I have some more information.
Kind Regards,
Sowande