The Explorer for ArcGIS application does not display labels in a feature service hosted on ArcGIS for Server and consumed in ArcGIS Online through the Create Labels option in the ArcGIS Online map viewer.
Last Published: September 8, 2015ArcGIS for Server
Bug ID Number
May 28, 2015
July 29, 2020
ArcGIS for Server
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
This is a known limit.
Labels are only supported on map services.To label features in a map, set up labels in ArcMap before publishing the service.