I created a tile map package in Pro. It displays correctly on top of the Topographic base map in Pro. However it does not display in Field Maps when sideloaded and it does not display in the AGOL Map Viewer as a hosted tile service. If I zoom to the layer in the Map Viewer it puts me in Algeria instead of Colorado, and it does not display there either. I wonder if it is a bounding box issue--reading coordinates off the screen in Pro puts the bounding box for longitude in the 11 million range, but the Properties dialog puts the bounding box for longitude at negative 11 million.