Logon Script not working

Hi, 

I need some help with the following logon script:

@echo off
net use * /DELETE/yes
if ingroup("Administrators")
net use x:"\\10.10.100.55\Users\%username%"
endif

and if instead the username is hard coded, it worked. 

The issue is that i need to apply it on the OU of the Active directory where there are many users in different groups  who are going to sign in. 

Thanking you for your help beforehand.

Ricky