Please be sure that the user you are trying to add actually is a member of the project and has the necessary permissions to be assigned an issue. You can do this simply by manually editing an issue in the project and editing the Assignee field.
I'd already gave all access to the user but still the same problem occur. Is it because my account also have a limited access to certain function? My colleague seems to be doing just fine.
So are you saying if you manually try to assign the issue to this user it works or does not? If it does not can you assign the issue to any other user?
I can manually assign the issue to user but as right now I'm exploring the JIRA automation function and this problem occur when I'm trying to set up rule.
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