My suggestions that work.

Either:

1) managed-settings.xml + managed settings (a desktop setting) for URL to

Add these Managed settings to users' desktops:

URL=http://community.customer.com/managed-settings.xml; com.ibm.rcp.managedsettings.provider.file, Enforce

with

<settingGroup name="com.ibm.collaboration.realtime"><setting name="enableAdvanced" value="true"/>

2) or just a managed setting (a desktop setting):

Add these Managed settings to users' desktops:

enableAdvanced=true; com.ibm.collaboration.realtime

Thank you Anders, solving by managed setting in desktop policy

CHEERS !