title: Azure Data Factory Linked service to Synapse Serverless Pool through Service Principal
body: <p>Am trying to connect to Synapse Serverless Pool using Service Principal but getting below error in my Azure Data Factory Pipeline.</p>
  <pre><code>Cannot connect to SQL Database: 'xxxxx-ondemand.sql.azuresynapse.net', Database: 'synapse_od', User: ''. Check the linked service configuration is correct, and make sure the SQL Database firewall allows the integration runtime to access.
  Login failed for user '&lt;token-identified principal&gt;'., SqlErrorNumber=18456,Class=14,State=1,
  Activity ID: 2516df76-0215-4f27-990d-3c4654a07704.
  **This may happen if your data source only allows secured connections. If that's the case, please use a VNet integration runtime**.
  </code></pre>
  <p>But can happily connect using SQL Authentication.</p>
  <p>Service Principal been granted Contributor role on Synapse.</p>
  <p>Any clues!!!!</p>