将应用部署至Azure Kubernetes Service失败：全局管理员权限不足

我正在学习Git课程，当前处于将应用推送至Azure Kubernetes Service（AKS）的步骤，联系PluralSight支持未收到回复，只能自行排查。预期成功部署至AKS，但我的全局管理员（Global Admin）账号却触发了权限报错。

已核查账号权限，确认拥有全局管理员权限，该账号应能执行错误信息中描述的范围下的凭据列出操作。通过对象ID（GUID）在Azure门户中查询，也确认该账号确实已分配全局管理员角色，按常理此角色应拥有全部权限。

环境变量和密钥在第一个任务build-deploy-image中均能正常使用，该任务执行无问题。

完整错误信息（已隐去账号GUID和订阅GUID） #

Error: "error":"code":"AuthorizationFailed","message":"The client '' with object id '' does not have authorization to perform action 'Microsoft.ContainerService/managedClusters/accessProfiles/listCredential/action' over scope '/subscriptions//resourceGroups//providers/Microsoft.ContainerService/managedClusters//accessProfiles/clusterAdmin' or the scope is invalid. If access was recently granted, please refresh your credentials."

工作流第二个任务的YAML代码 #

deploy-to-aks:
  runs-on: ubuntu-latest
  
  if: github.ref == 'refs/heads/master'

  needs: build-deploy-image
      
  #env:
    #NAMESPACE: dummy
  
  steps:
  
  - uses: actions/checkout@main
  
  # Set the target Azure Kubernetes Service (AKS) cluster. 
  - uses: azure/aks-set-context@v1
    with:
      creds: '${{ secrets.AZURE_CREDENTIALS_DEMO }}'
      cluster-name: ${{ secrets.AKS_NAME_DEMO }}
      resource-group: ${{ secrets.AKS_RESOURCE_GROUP }}

  # Create namespace if doesn't exist
  # - run: |
  #    kubectl create namespace ${{ env.NAMESPACE }} --dry-run -o json | kubectl apply -f -

  # Create image pull secret for ACR
  - uses: azure/k8s-create-secret@v1
    with:
      container-registry-url: ${{ env.ACR_LOGON_SERVER }}
      container-registry-username: ${{ secrets.SERVICE_PRINCIPAL_ID_DEMO }}
      container-registry-password: ${{ secrets.SERVICE_PRINCIPAL_PASSWORD_DEMO }}
      secret-name: ${{ secrets.AKS_SECRET }}
      # namespace: ${{ env.NAMESPACE }}

  # Deploy app to AKS
  - uses: azure/k8s-deploy@v1
    with:
      manifests: |
        manifests/deployment.yml
        manifests/service.yml
      images: |
        ${{ env.IMAGE_NAME }}
      imagepullsecrets: |
        ${{ secrets.AKS_SECRET }}
      #namespace: ${{ env.NAMESPACE }}

内容的提问来源于stack exchange，提问作者user1585204