For most searches, this problem has been fixed. However, be careful when setting the Alias Search Attribute. The value of the alias search attributes must be unique across an organization. If more than one alias search attribute is set, it is possible that one entry in the data store matches one attribute, and another entry matches with the other attribute. In this situation, Access Manager server throws the following error:
An internal authentication error has occurred. Contact your system administrator.
Workaround: None