Following instructions to configure an availability group on Azure SQL Server virtual machines in different regions, I'm trying to add an IP address resource to the cluster as described at step 10, but the option is not available.
The Add button is grayed out on the cluster properties dialog in the Failover Cluster Manager management console and I don't know why.
The cluster is online with two existing nodes. All nodes are running Windows Server 2016 Datacenter installed from Azure Marketplace offer SQL2016SP2-WS2016, sku Enterprise.