Here is a short YouTube video that describes how to link ArcGIS to the AGRC Discovery Base Map and Imagery Server.  ​

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In ArcMap under ‘add data’ select ‘Add WMTS Sever” – this stands for Web Map Tile Service
This is the URL you want to paste.  https://discover.agrc.utah.gov/login/path/escort-bless-college-felix/wmts/1.0.0/WMTSCapabilities.xml