Longitudinal survey, Login IDs are not displayed in the follow-up survey

Hi,

I am trying to set up a longitudinal survey using the instructions found here https://www.qualtrics.com/support/survey-platform/common-use-cases-rc/pulling-data-into-a-second-survey-longitudinal-surveys/

It seems to work, but the problem that I have is that the Login IDs are only visible in the baseline dataset and not in the follow-up. Thus, I can't link participants' responses of baseline to the follow-up.
Any idea how I can overcome this problem?

Thank you,
Dimitra