I am applying an Arcade Expression to style my feature layer in my web map. This Arcade Expression utilizes an AND (&&) and OR (||) statements. If I use the new ArcGIS Online Map Viewer, all label styles symbolize properly. If I use ArcGIS Online Map Viewer Classic, the label styles with the OR statements do not symbolize. Has anyone successfully used an OR statement in Map Viewer Classic?
Do you have an example expression? I've not run into this issue, personally.