dial-in tab greyed out in active directory users and computers

I am trying to delegate the "Dial-in" tab options to my Helpdesk AD group. I've followed the following directions (pasted below), but I cannot get the options to un-grey. I've manually sync'ed AD and copied the DSSEC.DAT file to all 3 DC's and the XP desktop itself. All attempts have failed.

Am I missing something?

What I did so far:
1. Open C:\windows\system32\DSSEC.DAT with NotePad.
2. Under [USER] section, find the following entries and change the value
from "7" to "0".

msNPAllowDialin=0
msNPCallingStationID=0
msNPSavedCallingStationID=0
msRADIUSCallbackNumber=0
msRADIUSFramedIPAddress=0
msRADIUSFramedRoute=0
msRADIUSServiceType=0
msRASSavedCallbackNumber=0
msRASSavedFramedIPAddress=0
msRASSavedFramedRoute=0

3. Open ADUC, click Action menu, choose the Delegation Wizard, and select
the group you want to delegate control, click next.
4. Create a custom task to delegate.
5. Select "Only the following objects in the folder", choose User objects
at the bottom of the list, and click next.
6. Select Property-specific, give read and write permissions to these
attributes.

Account Restrictions
Remote Access information
msNPAllowDialin
msNPCallingStationID
msNPSavedCallingStationID
msRASSavedCallbackNumber
msRASSavedFramedIPAddress
msRASSavedFramedRoute

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Peter A. Berger Jr.