Features that were selected using a workflow do not inherit the feature label, feature description, or other configuration that was defined on the layer
Make sure that the Map Service Id and Layer Name in the "SelectFeatures" Workflow task match the Map Service Id and Layer Name defined at the Rest Endpoint your site. You can use Layer Id instead of Name, however using the Layer Name is the preferred method.
The variable "MapServiceID" will hold the ID of the map service that the layer belongs to. The variable "LayerName" will hold the name of the layers. Ideally those two variables have to be passed as workflow arguments.