add SAN's to cluster config with rancher

I’ve created a k8s cluster with rancher. 3 controlplanes, 3 workers.
The plan was to install kube-vip on the cluster for a virtual IP with IP let’s say 10.10.10.10.

So I added 10.10.10.10 to the “TLS Alternate Names” in Advanced/Networking section on the create cluster screen. So after the cluster was created and download the kubeconfig. And change the server section into server: https://10.10.10.10:6443

kubectl outputs this message still:

Unable to connect to the server: x509: certificate signed by unknown authority

Is it possible to add more SAN’s to kubeconfig certificate with rancher?