Synchronize public IP addresses with the cloud provider

To onboard any public IP addresses that were already created in your cloud provider, or update changes made directly in the provider:

Privileges: Manage virtual network elements, Manage floating IPs, Access public networks tab, Manage public network elements

Go to Virtual datacenters → select a public cloud virtual datacenter → Network → Public
Click the double arrow synchronize public IPs button (beside the + add button)