I am having the same issue. Some people (me included, as I was also on the distribution list) are not getting the email generated by Qualtrics. It doesn't even appear as spam--they don't get the email invitation AT ALL. Qualtrics indicates that all the emails have been sent, and correctly indicates if something has bounced. But there are a LOT of email invitations that simply go missing, and you don't know who is not responding due to attrition/other, and who never got the invitation in the first place. This has some disastrous consequences for several of my active projects.
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