Hi @ManishK , welcome to the Atlassian Community and thanks for your question.
The answer depends a little on which platform you are using, Data Center or Cloud.
Either way, it should be possible to do an External System Import with the assignee and reporter fields. Here is the documentation which explains how to do the import - https://support.atlassian.com/jira-cloud-administration/docs/import-data-from-a-csv-file/ .
Please note, in the Cloud, you will need to indicate the email address or Atlassian ID and not just the username, like in Data Center.
If you have other questions or doubts, please just reply to this post.
I hope this helps you.
Cheers
Thank you @Valerie Knapp for your reply. I don't have admin access. I tried with email address but it didn't work.
How can I get Atlassian ID without admin access?
Thanks!
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