Powershell multi-line script not executing Invoke-Command

We have a multi-line script in powershell and Invoke-Commnand whithin this multi-line script is not working. Here is my job:

deploy:dev1:
  stage: deploy
  variables:
    SERVER: "SERVER_PATH"
  script:
    - |
      $env:PROJECT_LIST -split "," | ForEach-Object ({ 
        $ProjectName = $_

        Write-Host "Preparing '$ProjectName' for deployment"

        if ($ProjectName -eq "DEBUG_TEST_PROJECT") { # Just for debugging
          if ($ProjectName.ToLower().EndsWith('.api')) {
            $ProjectType = "services"
          } else {
            $ProjectType = "intranet"
          }

          $SourceDir = "$env:MSBUILD_OUTPUT_DIR\$ProjectName\_PublishedWebsites\$ProjectName"
          $ServerDestinationDir = "\\$SERVER\c$\inetpub\wwwroot\$ProjectType\$ProjectName"
          $AppPoolName = "${ProjectType}_${ProjectName}"

          Write-Host "Stopping AppPool '$AppPoolName'"
          Write-Host "Invoke-Command -ComputerName '$SERVER' -ScriptBlock { Stop-WebAppPool -Name '$AppPoolName' }"
          Invoke-Command -ComputerName '$SERVER' -ScriptBlock { Stop-WebAppPool -Name '$AppPoolName' }
          
          Write-Host "Deploying '$ProjectName'"
          Copy-Item $SourceDir\*.* -Destination $ServerDestinationDir
          Copy-Item "$env:BUILD_OUTPUT_DIR\webconfigs\$ProjectName\Web.$CI_ENVIRONMENT_NAME.config" -Destination $ServerDestinationDir\Web.config

          Write-Host "Starting AppPool '$AppPoolName'"
          Write-Host "Invoke-Command -ComputerName '$SERVER' -ScriptBlock { Start-WebAppPool -Name '$AppPoolName' }"
          Invoke-Command -ComputerName '$SERVER' -ScriptBlock { Start-WebAppPool -Name '$AppPoolName' }
        }
      })
  when: manual
  environment:
    name: Dev1
  dependencies:
    - build

Unfortunatelly, I get the following error:

It seems like git lab is not properly evaluating the command Invoke-Command. I run the exact same script locally and on the server (where the runner is installed) and it works, but not from the pipeline.

Any idea how to fix this?