I've added a new user through the "User Management" function, and granted them access to JIRA. However, when I open a new issue in JIRA, they don't appear in the "Assign to.." dropdown, and I can't find their name/email/username.
This ended up requiring the user to log out and log back in, and then they had access. <shrug>
The user should have "Assignable User" project permission in the project. See https://confluence.atlassian.com/display/JIRA/Managing+Project+Permissions
It looks like you're new here. Sign in or register to get started.