Millisecond Forums

Hi,

I am using CloudResearch service to recruit Mturkers, and Qualtrics service through which I redirect my participants to Inquisit Web study. 
I was wondering how I should implement the CloudResearch (TurkPrime) confirmation code at the end page. I clicked on the Show TurkPrime confirmation code button as below. 


Then, on the CloudResearch setup page, I chose the third option, which automatically generates the completion code that is unique to each participant as below.

However, when I try things out using a sandbox mode, the end page just gives me an error message like below.
 

How could I configure these correctly? I want participants to see the confirmation code which is not just their worker IDs.
Thank you for your time!