We have a study where the recruiters are assigning unique ID's (outside the Qualtrics system) to possible respondents. The respondents receive an anonymous link, enter the unique ID in the first question and confirm the unique ID in the second question. The issue is we are getting duplicate unique ID's in the completed data.
Is there a way to track the unique ID's that have already been entered for completed surveys, so someone else can't enter that same ID and complete the survey?
Best answer by TomG
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