Hello Muireann,
Thank you for contacting the Microsoft Community.
I understand that you want to take your AZ-900 in Certiport within your preferred area. I can provide you the right support team that can assist you and find alternatives.
For the Certiport testing center, I recommend contacting the exam provider for other options on how or where to take the exam, you can reach out here for the direct support page of Certiport here: Support :: Certiport (pearsonvue.com)
For an alternative, the exam AZ-900 is also sponsored by Pearson Vue, you can also pick a testing center under them as I searched Dublin Ireland from their find a test center page, there are a few locations to pick from. You can check sample of the first two locations below:
For more information, you can reach out to their support page at Customer service :: Microsoft :: Pearson VUE
Hope this helps, let me know if there's further assistance.
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Regards,
