Using terraform in an DevOps Pipeline

Hi,
I created a IaC Pipeline with terraform and azure devops. In the devops pipeline a added a storage account to store the tfstate file in the blob storage. When I run the pipeline, everything works, all services are created, but a can’t find the tfstate file in the storage account. here is the code of the yaml file:
jobs:

- deployment: deployDev

  continueOnError: false

  environment: 'dev'

  strategy:

    runOnce:

      deploy:

        steps:

          - checkout: self

          - task: TerraformInstaller@0

            displayName: 'install'

            inputs:

              terraformVersion: '0.12.3'

          - task: TerraformTaskV1@0

            displayName: 'init'

            inputs:

              provider: 'azurerm'

              command: 'init'

              backendServiceArm: ' (XXX)'

              backendAzureRmResourceGroupName: 'terraform-rg'

              backendAzureRmStorageAccountName: 'editerraformaccount'

              backendAzureRmContainerName: 'editerraformcontainer'

              backendAzureRmKey: 'terraformDev.tfstate'

              workingDirectory: $(System.DefaultWorkingDirectory)/Terraform/Dev

          - task: TerraformTaskV1@0

            displayName: 'plan'

            inputs:

              provider: 'azurerm'

              command: 'plan'

              #commandOptions: '-input=false'

              environmentServiceNameAzureRM: ' (XXX)'

              workingDirectory: $(System.DefaultWorkingDirectory)/Terraform/Dev

          - task: TerraformTaskV1@0

            displayName: 'apply'

            inputs:

              provider: 'azurerm'

              command: 'apply'

              #commandOptions: '-input=false -auto-approve'

              environmentServiceNameAzureRM: ' (XXX)'

              workingDirectory: $(System.DefaultWorkingDirectory)/Terraform/Dev

Any ideas?
regards
Andreas

Is the state-file loaded if you rerun the pipeline?