This is indeed not a feature of Jira. There was a feature request for this raised a few years ago, but it was decided that it won't be implemented:
You will need to manually upload the same avatar on both applications.
Let us know if you have any questions about this.
One more thing, there are a few more workarounds on this page:
You may be able to use something such as Gravatars to sync across both apps, so please feel free to give that a try.
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs