Hi chrisgill ,
The GeoJSON file contains valid coordinates and attributes. You can validate your GeoJSON file using online tools like geojson.io.
Try deleting the current reference layer and re-uploading the GeoJSON file to the Azure Maps visual in Power BI and ensure that your GeoJSON file is formatted correctly. For example, if you want to add a polygon to your Azure Maps visual as a reference layer, you have to format your .json or .geojson slightly differently than a point feature.
Did you export from mapshaper in ‘wgs84’ (coordinate system). ? You may type in the console in mapshaper and then export it as topojsonproj wgs84.
Solved: Corrupted map visual using a shp file converted to... - Microsoft Fabric Community
Best regards.
Community Support Team_Caitlyn