Currently we cannot expect a username string in JIRA "justin" to equal the username string "justin@atlassian.com" in Confluence.

For trusted apps to work JIRA and Confluence need to have both users to have the same name.

With Application aliasing in Crowd we have complicated matters some what in allowing "justin" in JIRA to equal "justin@atlassian.com" in Confluence. However if their is a trust relationship between both these applications the 'trust' will fail for this user.

This requires work to make the UserResolver in trusted apps 'plugable/configurable' so Crowd can correctly translate one username to another username for these requests.