Jira Users Cannot be Found by Email or Name

Question: Why do I get an error 'The user with the email address (full name) xxxxxx does not exist'?

Answer: Most likely, the users did not make their email addresses and/or names public in their Jira profiles, and, as result, your account does not have access to this information. Ask the users to update their profile visibility settings in Jira to resolve this issue.