I have JIRA and Tempo Administrator permissions, but for some reason when I go into Tempo Timesheets and start typing certain user names, Tempo says there are no matches found. This happens on with multiple users. I have tried typing both the user name and the full name and they still don't show up. I have made sure that all of these users have the time track permission and the browse users permission. I just don't know what else could be causing them not to show up.