Not directly - fields are made mandatory on an issue type basis, not assignee.
But you can add a validator to enforce it in the workflow. Two options:
I think you can also do it with the Behaviours functions in the script-runner, but that could be bypassed by someone if they try.
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
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot