Hi @Muqaibil Yes - the Qualtrics support helped me out. It can be done using the authenticator and a contact trigger list but it's counter-intuitive: you have to set the survey flow so that failing the authentication means you get access to the survey (i.e. ID number entered in the authenticator doesn't appear in the trigger list, so they have done the survey before, therefore they get access to the survey), and passing the authentication (i.e. the ID entered does appear on the trigger list) takes you to a message telling the participant that their ID appears to have already taken the survey. If you contact support they can make a short video for you explaining the process. They did it for me, but unfortunately the link has expired so it's not available anymore. Here is their reply to me: Thank you for contacting Qualtrics Support! After investigating, I was able to come up with a workaround solution for using authenticators to prevent respondents from taking the survey more than o
Thanks, I've set up the contact list, but I can't see how you can use the authenticator to check a complete flag. It seems to only check a contact list for an email address or external reference (studentID), but I want to stop respondents completing the survey more than once using their studentID. I don't know which students will complete the survey, so I need the authenticator to check an inputted studentID against a contact list, if there is a match, skip to the end of the survey, and if there isn't a match, skip to the question block. In this question block, once they have completed the final question I have a trigger to add the respondent to the contact list. So, for first respondents, they fail authentication and skip to questions, then are added to the contact list. If they attempt to repeat the survey, they will 'pass' authentication (because their student ID will be in the contacts list) and skip to the end of the survey. It doesn't seem to allow this, as failing authentication
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