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This link https://www.ireland.anglican.org/cmsfiles/pdf/AboutUs/library/registers/ParishRegisters/PARISHREGISTERS.pdf shows the status of Church of Ireland parish registers in Ireland. If you scroll down to Youghal, the record indicates that the Youghal records are maintained in the Representative Church Body Library in Dublin. I think eventually those records will be digitized and placed online. In the interim, if you want to get the record, you might need a professional researched to check the Youghal records.