After some tinkering I think I have a solution worked out. The survey is split into two (or more) blocks. The first block simply asks for name and (validated) email address. The actual questions are on the remaining block(s). In the Survey Flow, first embedded data Q_URL is added at the very top. Then after the first block, a branch is created with logic If Q_URL Does Not Contain Q_R thenEnd of Survey. The first time someone enters the survey using the anonymous link they will hit this End of Survey element. At that point there is an email trigger that sends an email to the respondent, using piped data to build the retake link. When the person uses that link they will bypass the End of Survey element because Q_URL will now contain Q_R data and now they can complete the remaining questions.From the documentation it seems like you may have multiple retake responses if you don't build &Q_R_DEL=1 onto the link.
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