Token required error: Error code 500.

I have created a workflow to fetch related record using ArcGIS Server service. I created a workflow with relationship query activity and passed the token from the map service. This throws "Token required" error.

 

 

I also tried alternative way by adding a generatetoken activity to the workflow to generate a token and pass it to the relationship query activity as an argument. Doing this throws "Unable to generate token error". Is there any other better way deal with the ArcGIS Server tokens in geocortex?