I am assign an issue in multiple user. I don't want to share, create a sub task.
There is no way to assign issue to multiple users in jira!
there are alternative ways explained in following doc
https://confluence.atlassian.com/jira/how-do-i-assign-issues-to-multiple-users-207489749.html
In almost all instances in real life if one person isn't responsible the issue won't get worked and no one will actually know the status.
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