IP Address is not shown for a domain that belongs to a reseller or reseller's customer in Domains > example.com > Web Hosting Access > IP Address
IP Address is not added in reseller's pool of IP addresses. Reseller has a separate IP pool. Only IP addresses from reseller's IP pool can be used for his own subscriptions and for subscriptions of reseller's customers.
Assign IP address to reseller's IP pool:
Home > Resellers > reseller_name > IP Addresses > Add IP Address