Unable to initialize kubernetes provider with `listClusterAdminCredential()`

[mjlshen]

Bicep version

❯ az bicep version
Bicep CLI version 0.27.1 (4b41cb6d4b)

Describe the bug I am attempting to create an AKS cluster and initialize the Bicep extensibility Kubernetes provider and am unable to do so, running az deployment group create I get the following error:

InvalidTemplate - Deployment template language expression evaluation failed: 'The template function 'listClusterAdminCredential' is not expected at this location. Please see https://aka.ms/arm-functions for usage details.'. Please see https://aka.ms/arm-functions for usage details.

To Reproduce Steps to reproduce the behavior:

1. Reference an existing AKS cluster or create a new one, then try to retrieve its kubeconfig and use it

resource aks 'Microsoft.ContainerService/managedClusters@2024-02-01' existing = {
  name: 'aks'
}

provider kubernetes with {
  kubeConfig: aks.listClusterAdminCredential().kubeconfigs[0].value
  namespace: 'default'
}

2. Attempt to deploy it, e.g.

az deployment group create --name "test" --resource-group "test" --template-file "test.bicep" --confirm-with-what-if

Additional context

• Trying to follow the documentation in https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/bicep-extensibility-kubernetes-provider
• I was able to find a similar report in https://github.com/Azure/bicep-extensibility/issues/134#issuecomment-1533875049 if that's a better place for this