Unfortunately, it is not currently possible to change the reporter of Jira issues from the Vanta UI. The reporter will always be set to the person who initially connected the Jira integration. If you wish to change the reporter, you will need to re-connect (not delete) the integration. Please ensure that you have admin permissions in Jira before reconnecting.
Prerequisites
Administrator access to Vanta
Admin permissions in Jira
Resolution
Sign in to Vanta and head to the Integrations page
Scroll down to Jira and click Manage, followed by Edit
Click the purple Connect Jira
After following through with the connection, the integration should be re-connected, and the reporter of all tickets moving forward will be the user who re-connected the integration.