In this blog post, you’ll learn more about the SQL Server Error Code 19455 and the error message description that is shown
SQL Server Error Code
19455
SQL Server Error Description for the Code :19455
The WSFC cluster does not have a public cluster network with an IPv4 subnet. This is a requirement to create an availability group DHCP listener. Configure a public network for the cluster with an IPv4 subnet, and try to create the listener.