Restricting users in Broadcast

Hello,

I am trying to restrict certian users from sending braod cast messages. Only want admins and conference admins to be able to send broadcast messages. I have added

plugin.broadcast.serviceName - broadcast

plugin.broadcast.disableGroupPermissions - false
plugin.broadcast.groupMembersAllowed - true

plugin.broadcast.allowedUsers -admins

**and restarted the service, but regular users still are able to broadcast. I am using ldap intergrated security. Can someone help me out, i tried added individuals to allowedusers and still didnt work.
**