Cannot log in using email address with LDAP Decision Node

Bug description

Authentication fails with Not Found error when using authentication trees configured with mail as an attribute used to search for a user to be authenticated.

How to reproduce the issue

1. Install AM 6.5
2. Create realm: myRealm
3. Create an authentication tree: myTree
4. Configure a Page Node containing Username Collector and Password Collector Nodes.
5. Link the Page node to an LDAP Decision Node
6. Add mail attribute to Attributes Used to Search for a User to be Authenticated field
7. Add demo@example.com as the Email Address for the demo user
8. Login via the tree e.g. http://am.example.com:8080/access/XUI/?realm=myRealm&service=myTree#login

Expected behaviour

User is redirected to the profile page

Current behaviour

A Not found error is displayed. See attachment.

Work around

None identified.