Not able create configuration for admin to add users from any network

Hi Team,

I am using ejabberd 15.09. I want to allow admin to create new users from any network.
I am creating users programmatically using smack library
I tried various options but not able make it work. Below is my configuration

access:
    register:
        admin: allow
  trusted_network:
    all: allow


mod_register:
       ip_access: trusted_network
       access_from: register
       access: register

I feel above configuration should work, but I am not able to create an account.

Regards,
Ashwin