Thank you for reaching out.
Can you please let us know in which format you want to export the unique entry from your Jira Users?
I mean, are you trying to migrate a list of users with the unique ID or are you trying to export issues where the assignee and reporter fields are returning the unique ID instead of the user name?
For a list of users, you can export it logged as a site-admin by navigating to User management > Users > Export users:
The e-mail address will be included in the export file.
Now, if you want to export issues with the e-mail of the related assignee/reporter, you can add a custom field to collect their e-mail. These would be the steps:
1 - Create a new custom field(s) to collect the e-mail of the Assignee/reporter and add it to your project screens
2 - Use a JQL query to return all the issues of a specific assignee/reporter
3 - Use the bulk update feature to update all the returned issues with the relevant Assignee/reporter e-mail in the new custom field
4 - Repeat the process to each assignee/reporter
5 - Create a JQL query with the issues you want and export it to a CSV file
Let us know if you have any questions.
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