Is it an eligible education institution?

yes

Is this part of National University? https://www.nu.edu/studentservices/studentbusinessservi/faqs-1098-t/

University College Dublin no EIN number

The University College Dublin is listed as eligible university to  participate in the federal student aid programs . That is good news, but I don't believe you will be able to efile in ProSeries, so it looks like you have to mail it in. Don't know why ProSeries does not allow, because I think Turbo Tax allows you to enter 99-9999999 as ein. Found this link in case you need to get a substitute 1098.

  https://www.ucd.ie/global/study-at-ucd/scholarshipsfinances/filingnorthamericantaxes/

For Lacerte try entering ForeignUS in the EIN field.