I faced below error when I tried to create AKS with Windows OS following steps in here

az aks create \
    --resource-group DockerResourceGroup \
    --name win-test-aks \
    --node-count 2 \
    --enable-addons monitoring \
    --kubernetes-version 1.14.6 \
    --generate-ssh-keys \
    --windows-admin-password "P@ssw0rd12345" \
    --windows-admin-username testuser \
    --enable-vmss \
    --network-plugin azure

Error:
Operation failed with status: 'Bad Request'. Details: Virtual Machine Scale Set agent nodes are not allowed since feature "Microsoft.ContainerService/WindowsPreview" is not enabled. Please see https://aka.ms/aks/previews for how to enable features.

I tried to run az feature list -o table with below features installed already:

Microsoft.ContainerService/MultiAgentpoolPreview   Registered
Microsoft.ContainerService/VMSSPreview             Registered
Microsoft.ContainerService/WindowsPreview          Registered
Microsoft.Web/CentralUSRegionEnabled               Registered