Duplicate detection (IP + time window)

It looks like you’re trying to build a pretty specific validation gate, but unfortunately, there isn’t an out-of-the-box feature in Qualtrics that handles that exact combined logic of matching a survey branch, an IP address, and a 5-minute window directly within the survey workflow.

While Qualtrics has tools like Duplicate Detection and "Prevent Multiple Submissions," they don't quite hit all those marks at once. Duplicate Detection flags responses after they are submitted based on IP and cookies (using the Q_DuplicateRespondent field), so you can't really use that flag for real-time branch logic while the person is still taking the survey. Similarly, the "Prevent Multiple Submissions" setting is a bit more rigid, relying on a 6-month cookie rather than a customizable 5-minute timer. 

To get this working, you'd likely need a more custom setup. You could capture the IP address as embedded data and track the specific branch path, then use an external workflow or API integration to flag those responses post-submission. Expert Review Fraud Detection is great for catching bots and speeders, but it doesn't support that specific multi-condition time-window logic inside the survey flow either.

If this is causing some major headaches or you think there might be a bug with how your current fraud settings are firing, it might be worth touching base with the experts over at the Customer Success Hub. You can log in through your account and drop them a note here: https://support-portal.qualtrics.com/

They should be able to take a closer look at your specific setup and see if there's a more advanced workaround!