bulgin wrote: However, whenever I import .csv file without errors something is happening in that process - despite no error messages - that does not trigger the system to recognize the same token over and over again.

For narrowing the issue create a new participant list. Create one dummy participant. Export the CSV. Compare it to your CSV you want to import. Perhapy copy and paste a few participants into the dummy export and import that file.

Thank you. I'm working this through and hope to be able to post some insight in the next few days.

Thank you.

If you delete token table and import it again : you reset the token