When a Web Map Service (WMS) service that contains grouped layers is added to the ArcGIS Online map viewer, the groups are not maintained.
Last Published: February 2, 2015ArcGIS Online
Bug ID Number
November 21, 2014
August 21, 2020
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.