By default, ArcGIS Pro is licensed by Named User. To authorize ArcGIS Pro with Concurrent Use or Single Use licenses, you can convert your Named User licenses through My EsriArcGIS Pro Named User licenses are converted to ArcGIS Pro Concurrent Use licenses if your ArcGIS Desktop licenses are Concurrent Use. They are converted to ArcGIS Pro Single Use licenses if your ArcGIS Desktoplicenses are Single Use. See Convert Named User licenses to Concurrent Use and Convert Named User licenses to Single Use for more information.