I will be collecting the data before and after intervention for two separate groups. I want my participants truly anonymous, at the same time link their first and second responses.

I have read & watched about "embedded data" and "email trigger" but I still have concerns about anonymity since it is asking for e-mails. Also, when I applied embedded data and made sure that it was valid, the Random ID hasn't been displayed. Could you please explain how to do it?