I had the same problem and it took a while to figure it out. So if you are publishing a layer, make sure you do not change the path of your feature class that is on your map. I moved my feature class to a different dataset within my geodatabase and I think thats what triggered the "Staging failed" message. Even though the feature class is present on the Map, Pro won't recognize it because you changed the path. So you have to drag the feature class into the map again, but with its new path. Hope this helps ..................... 6 months later
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