The GeoForm web application template does not allow fields used to symbolize the feature to be unchecked before publishing it as a service to ArcGIS Online.
Last Published: February 12, 2016ArcGIS Online
Bug ID Number
November 6, 2014
March 30, 2022
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 as designed. GeoForm makes fields with domains that have editing templates as required, because the application potentially sets the values of other fields when changed.
Do not set the symbology before publishing to ArcGIS Online.