I cannot see a particular User in the user selector
Nor mention him in a comment.
I'm site administrator, and I can locate this user in the users list. He seems to be in the right status.
This may not be you - In the last 2 days I have had 2 users 'disappear' in confluence (though I realize this is jira you're referring to) - support pointed me to this bug:
https://jira.atlassian.com/browse/ID-7089
If you submit a real support ticket they can try to fix individual users.
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If you can't select or mention a particular user, it probably means that they cannot see the issue you are working on, or they have been removed from Jira.
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He do see the issues. As a workaround I sending issue's links and he assign them to himself. But this is annoying.
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Please check permissions and crossref the groups/roles to see if the user is in them. Check the Assignable user, browse, etc.
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if classic project - project settings > permissions
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I've checked and the user belongs to the groups listed in the assignable users section of Issue Permissions.
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