Follow the steps below to Assign Issue to Multiple Users
Go to Wheel Icon (Settings at the top-right corner) > Select “Issue” > Click on “Custom fields” >Click on “Create custom field” button (at top-right side) > Find and Select “User Picker(multiple users)“
Once selected a pop-up will appear, Give the field a Name and Description > Select the Screens to have this option > Click on “Update” button > Now go to a story, and there will be Multiple Assignees option available.
Note: You must have Jira Administrative permissions for this.
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