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Could you please share on which of the forms are you trying to create another unique id? And what are the steps taken by you to achieve that?
This will help us investigate further.
I did a duplicate unique id, then update it as a confirmation id. It did not work.
I checked this issue and I was able to replicate it, the prefix of second Unique ID is not showing in submissions.
I will forward this thread to our backend team for further checking.
We'll inform you once the issue is resolved.
Thank you for reporting it.