New web app. VESPR Study Portal

Slightly confused on the redirection to the debriefing page—when I should be redirecting from pavlovia to the debrief page on VESPR, I only get the front portal page rather than the debrief associated with my experiment. I’m using a link in Pavlovia/psychopy that looks like
$"https://moryscarter.com/vespr/portal/debrief.php?expt=186&id="+expInfo['id'] (so that the ID gets passed back through to Prolific to pay the participants). What am I doing wrong?

Also, your video linked in this post Qualtrics to Psychopy back to Qualtrics - #15 by wakecarter was extremely helpful—thanks for making it!