WF5 Arcade Activity - Async Arcade must be enabled on this script

Hello

I am wanting to run an arcade script that generates a new featureset which i will use in a show results activity. The arcade consists of a few loops, and i have tested it with a hosted feature layer on AGOL. When i run my workflow i get an error “Async Arcade must be enabled on this script”.

How do i enable Async?

My arcade is

var DistinctIntersectingBuffers_FS = distinct($IntersectingBuffers,'Area')

// create empty featureset using list of fields and specifying geometry
var final_dict = {fields:[{'name':'Sites',                          
                         'type':'esriFieldTypeString'},
                         {'name':'Area_',                          
                         'type':'esriFieldTypeDouble'}],
                         'geometryType': 'esriGeometryPolygon',
                         'features':[]
                         }
                   
// loop through 
for (var Intersect in DistinctIntersectingBuffers_FS){

 var Inter_area =Intersect['Area']
 console(Inter_area)

 var MatchingIntersects = filter(IntersectingBuffers_FS,'Area=@Inter_area')
 
 console(count(MatchingIntersects))
 var SiteList =[]
 
 for (var MI in MatchingIntersects){

   var splitSites= Split(MI['Sites'], ', ')
   for (var ss in splitSites){
   push(SiteList,splitSites[ss])}
 }

   
   var f = {'geometry':geometry(first(MatchingIntersects)),
           'attributes':{'Sites':Concatenate(distinct(SiteList),', '),            
                          'Area_':Inter_area
                          }}
                          console(f)
  push(final_dict.features,f)

  }

return featureset(text(final_dict))
 

Thanks

Peter