I am very confused why some open map cannot be loaded into ArcGIS online but needs to be logged in.
https://data-carltoncounty.opendata.arcgis.com/maps/DCENR::lidar-coverage-office-of-public-works-opw-national-aerial-survey-contract-nasc-ireland-roi-itm-1/explore?location=53.531464%2C-8.236050%2C8.00
Your map just worked for me right now, but I had this problem before. I was told by ESRI support that there is a known bug that is prompting log-ins when sharing web maps that are shared with the public.
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