No. Assignee can't be more than ONE person, let alone two. It's a single select, and it's a single person because as soon as there's two, in real life, you don't know who is responsible and ownership goes wrong.
Have a read through https://confluence.atlassian.com/jira/how-do-i-assign-issues-to-multiple-users-207489749.html for involving more than one person in the ownership, but always work on the principle that the issue is currently with the assignee and they're the one single person ultimately responsible for dealing with it.
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