How to enable 'Show Popup' list action when using a data expression

[LClark1102]

I used a data expression to create a new FeatureSet by joining two existing FeatureSets. I've copied the code I used below. Since I also imported the geometry, I'm able to use the zoom/pan actions when the list item is clicked. However, the 'Show Popup' action is not available. I'm guessing this is due to using a data expression, but is there a way to create a new Popup to associate with the new FeatureSet?

var portal = Portal('https://***.maps.arcgis.com')
var project_field_points = FeatureSetByPortalItem(portal, '3251059bad18424893cb90726e840c00')
var projects = FeatureSetByPortalItem(portal, '46e225a5e2884852969839bc958cc727')

var features = []
var feat

for(var field_point in project_field_points) {
  var contract_id = field_point.Contract_ID
  var row = First(Filter(projects, 'ID = @contract_id'))

  feat = {
    attributes: {
      Contract_ID: contract_id,
      Project_Name: row.Name,
      Status: row.Status,
      Pay_Item: DomainName(field_point, 'Pay_Item'),
      Units: field_point.Units
    },
    geometry: Geometry(field_point)
  }
  Push(features, feat)
}

var joined_FS = {
  fields: [
    { name: "Contract_ID", type: "esriFieldTypeString" },
    { name: "Project_Name", type: "esriFieldTypeString" },
    { name: "Status", type: "esriFieldTypeString" },
    { name: "Pay_Item", type: "esriFieldTypeString" },
    { name: "Units", type: "esriFieldTypeSingle" }
  ],
  'geometryType': 'esriGeometryPoint',
  'features': features
}

return(FeatureSet(joined_FS))