Update from Git - Azure Devops Pipeline

I'm trying to construct an Azure Devops pipeline to orchestrate our deployment process. One of the first steps I need to accomplish is to update our Development workspace from Git. I was thinking it could be done by calling the updateFromGit Fabric REST API method. Unfortunately, while I believe I have an YAML script that works, that method will not work with Service Principals. Has anyone actually gotten something like this to work? Seems to me, this is an enormously huge miss in Microsoft's CI/CD strategy with Fabric.

- powershell: |
    $body = @{
      client_id = "$(PBI_CLIENT_ID)"
      scope = "https://api.fabric.microsoft.com/.default"
      client_secret = "$(PBI_CLIENT_SECRET)"
      grant_type = "client_credentials"
    }
    $response = Invoke-RestMethod -Uri "https://login.microsoftonline.com/$(PBI_TENANT_ID)/oauth2/v2.0/token" -Method Post -ContentType "application/x-www-form-urlencoded" -Body $body
    $token = $response.access_token
    $headers = @{
      Authorization = "Bearer $token"
      "Content-Type" = "application/json"
    }
    $body = @{
      remoteCommitHash = "$(GIT_COMMIT_HASH)"
      conflictResolution = @{
        conflictResolutionType = "Workspace"
        conflictResolutionPolicy = "PreferWorkspace"
      }
      options = @{
        allowOverrideItems = $true
      }
    }
    Invoke-RestMethod -Uri "https://api.fabric.microsoft.com/v1/workspaces/$(PBI_WORKSPACE_ID)/git/updateFromGit" -Method Post -Headers $headers -Body ($body | ConvertTo-Json -Compress)
  displayName: 'Update Power BI Workspace from Git'