Dynamic Security username () problems

Question

Hi,
I need some help with the following situation. I am trying to put into place asome sort of dynamic Security in my cube. With some help , I manage to get something working:
select [Measures].[Sales Net Amount] on columns,
 NONEMPTY(
    [Dim Restaurants].[Restaurant].[Restaurant].members,
    ([Measures].[count],
    StrToMember("[Dim User].[User].&[2]")))
    on rows
 from [XYZ]
my  problem is the minute I replace StrToMember("[Dim User].[User].&[2]"))) with
StrToMember("[Dim User].[User].&["+ username() +"]"))) I get no result at all , look like this function is non existant but everey blog/post I looked they keep using this function. 
Something is missing qand I do not see it , I am using SSAS 2012 and quite new to all of this

Answer 1

The username function returns a string in the form of "domain\user" so I highly doubt that you will ever get a value of "2" coming back.
If you run the following query you can see what this function returns in your environment 
with member measures.UsrName as username()
select { measures.[UsrName] } on 0 
FROM [XYZ]
You need to base your dynamic security on an attribute that has data in the same format that the username() function returns.
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