When trying to publish a map I receive two errors. The first is a 00216 Map does not contain a base map. That is easy to fix and I add one but then it results in a 00230 Service layer has a different projection than the maps's projection. I can remove the base map layer as that is what is the one using a different projection but then I am back to the first error. Why do our layers have to match the WGS 1984 projection coordinate system of the basemap. Is there a way around this?
I found someone with a the same issue. coordinate system - Map Publishing Issues? ArcGIS Pro - Geographic Information Systems Stack Exchange