My whole experiment works fine when I test it from the Millisecond "Open Launch Page" button, as well as if I manually append '?workerId=1' to the link in my browser, but when I click "preview link in new tab" on TurkPrime, I get this error: Unable to get subject id from URL parameter 'workerId'.
On Millisecond, I set it to generate participant IDs from the URL parameter 'workerId' as so, like I am told to for TurkPrime :
Is there anything else I am missing?