I read through the links you both provided, and I think the problem is due to the fact that I have an Arc Online account through a university, but I bought a single-user license for ArcGIS for myself that isn't linked to the university. So maybe I could link accounts so that I could use Pro and Online? But also, once ArcMap goes away, how will anyone use ESRI products if they don't work for the government or a university? This sounds like a bad idea....
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