The Jira user card is available on the following screens:
Jira issue → Developer panel (Assignee / Reporter)
Hover the mouse pointer on the name of the user. A small information box containing information such as email, zone & time and avatar for that user will appear.
Click Reported issues to view the latest reported issues performed by that user.
Click View profile to view this user’s profile.
The Git user identity should be configured for the specific user. Otherwise, the user card information will not be displayed for that user.
« Git user identity
Jira issue page »