User record deleted from Atlassian: This occurs as the result of a right to be forgotten request. In this case, displayName provides an indication and other parameters have default values or are blank (for example, email is blank).
User record corrupted: This occurs as a result of events such as a server import and can only happen to deleted users. In this case, accountId returns unknown and all other parameters have fallback values.
User record unavailable: This usually occurs due to an internal service outage. In this case, all parameters have fallback values.
Returns current user object (async operation) with details as permitted by the user's Atlassian Account privacy settings.