Web Map Service (WMS) services that are not hosted on ArcGIS for Server do not honor refresh interval set in ArcGIS Online.
Last Published: November 17, 2015ArcGIS Online
Bug ID Number
October 28, 2015
June 2, 2021
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.
Refresh on WMS layers only works if the WMS service honors standard http caching rules. We need to rely on the WMS server to tell if the data has changed or not.