Try undef()

Author: psychomantys

roles/kubespray_defaults/defaults/main/main.yml

@@ -11,10 +11,7 @@ ping_access_ip: true
 
 # Setting this value to false will fail
 # For details, read this comment https://github.com/kubernetes-sigs/kubespray/pull/11016#issuecomment-2004985001
-kube_api_anonymous_auth: "{{ kube_api_anonymous_auth | default(undef()) }}"
-
-# Disable argument kube_api_anonymous_auth on kubadm, --anonymous-auth will not be true or false, but removed.
-kube_api_anonymous_auth_disabled: false
+kube_api_anonymous_auth: true
 
 # Default value, but will be set to true automatically if detected
 is_fedora_coreos: false