Can you get your Site Admin to provide you a list of users and their usernames?
An alternative which I've used in the past is to create the mapping from existing assigned issues in Jira - this is how we did it:
This way you have a list you can re-use of usernames vs display names for CSV imports.
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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