@saraew1 have you tried creating a standard TPK instead of TPKX? Also, when you upload the TPKX to AGOL, are you then creating a hosted tile layer? In the settings of that hosted tile layer, can you see the cached tiles in the cache table? Also, when you're creating the original tpkx, are you using the standard AGOL tiling schema, or a custom schema? Also, have you set your coordinate system of the data frame to Web Mercator auxiliary sphere before creating the tile package? It looks like youve tried to add it as a layer within the Map Viewer, so needs to be in epsg3857. If you want it as a basemap in a different coordinate system, you can 'add as a basemap' and that will then set the SRS for the web map.
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