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check the way you build the kubeconfig

this.kubeconfig = interpolate`apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ${this.cluster.masterAuth.clusterCaCertificate}
    server: https://${this.cluster.endpoint}
  name: ${this.cluster.name}
contexts:
- context:
    cluster: ${this.cluster.name}
    user: ${this.cluster.name}
  name: ${this.cluster.name}
current-context: ${this.cluster.name}
kind: Config
preferences: {}
users:
- name: ${this.cluster.name}
  user:
    exec:
      apiVersion: <http://client.authentication.k8s.io/v1beta1|client.authentication.k8s.io/v1beta1>
      command: gke-gcloud-auth-plugin
      installHint: Install gke-gcloud-auth-plugin for use with kubectl by following
        <https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke>
      provideClusterInfo: true
`;

this one works