In some instances, when configuring the feature search settings to locate features in an ArcGIS Online web scene, clicking the Add Layer button under the Find Locations setting does not load the list of layers available in the web scene.
The feature search setting is disabled and the list of layers is not populated under the Find Locations setting when either of the two layers are present in the web scene:
As a workaround, add the scene layer or the hosted feature service to the web scene by entering the URL of the layers using the steps below.
Note: The existing scene layer or hosted feature service in the web scene must be removed. To do this, open the web scene in Scene Viewer and click Modify scene. Click the ellipsis button of the layer > Remove.
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