Folder share with permisions

Hi All

When I create a new user and fill out all the info fields for instance:
name : jdoe
Full Name: John Doe
Description: IT Employee

and so on......

When I share a folder i can add local users to the folder and it will show
the user "John Doe". Then when i take this user shown it will say it cannot
find this user. When I type in the Alias "jdoe" then it will find the user
and add it .

Is there a bug?

Zeus