Crossposting from here: https://community.esri.com/t5/arcgis-online-questions/arcgis-online-new-map-viewer-doesn-t-support-wms/m-p/1325246#M54350
Please provide support for WMS legends in the New Web Map Viewer spec. It works if you add the legendURL in manually, but the webmap by default doesn't add it, and there is no gui to add it yourself.
Thanks,
Marc
This is also for us a big issue. Please addess this as soon as possible.
This really needs to be addressed. We can see the WMS legend in classic web map viewer, why not in the new one?
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