Google Chrome version 72 prevents the drag-and-drop GeoTag workflow in ArcGIS Maps for Sharepoint. This has been logged as BUG-000120071. This defect is currently in the product plan and a fix is being developed.
Steps to Reproduce
Items from the Geotag panel drag onto the map and are tagged with the Geotagging attribute configured for the layer as outlined in Geotag documents
Esri is working to resolve this issue with Chrome. In the interim, use any other supported browser to complete this workflow.