Many thanks for your great efforts! For Dublin, the "approved" prayer timetable (referred to as ICC (Dublin)) does not seem to match with local mosques here in Dublin. As far as I know, ICC is actually a UK organisation; I assume you should rather use an Irish organisation to approve your timetable. I humbly suggest that you instead use the prayer timetable of either Dublin Mosque (Islamic Foundation of Ireland) or ICCI (Islamic Cultural Centre of Ireland) as a reference so that we be able to make use of the app.
Reference 1: https://islamicfoundation.ie/timetable/
Reference 2: https://timetable.islamireland.ie/