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Cannot transform TM_65 to GCS_WGS_1984 - Help!

Question asked by adam_brodie182 on May 5, 2017
Latest reply on May 10, 2017 by MKennedy-esristaff

I have imported a shapefile of Northern Irish DEA boundaries, default projected at TM_65 Irish grid coordinates. I want to re-project them to GCS_WGS_1984. However, my Project tool tells me that all available projection changes (eg. TM65_To_WGS_1984, TM65_To_WGS_1984_2, etc.) are invalid transformations. How do I fix this error?P