I created a mosaic dataset of street map images (locally purchased street mapping) in ArcGIS Pro 2.7 then created a tile package of the mosaic.
I turn the Stretch Type to None and save the Map and it appears like the first screen capture below. When I then generate a tile package off the map I get the second image below. No matter what I do to the symbology I still get pretty much get the purple background.
Any ideas?

