Hi there, I also have this problem, and tried turning it to inactive and then back to running, with no url. The code seems to work ok offline. Are there alternative things to try to get the url to generate? We are using jspsych + pavlovia (to send data to the server, but really we are running a jquery-based plugin scheduler that we are converting to jspsych style json – could that be part of the issue?). Thanks so much.
Also I wasn’t sure where people would reply so I also replied to this post: No URL is generated for an active experiment in the Recruitment section of the Pavlovia Dashboard