A grouped symbology from ArcMap are duplicated in ArcGIS Online filter.
Last Published: September 23, 2015ArcGIS Online
Bug ID Number
September 21, 2015
August 21, 2020
Operating System Version
7.0 64 Bit
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.
It is not supported in the REST API. The specification for the unique value renderer does not support value groupings at this time.