Subnet deletion blocked by orphaned App Service serviceAssociationLink

To remove the orphaned Service Association Link (SAL) from the subnet, you can follow these steps:

1. Purge the orphaned Service Association Link: Use the Azure CLI command to delete the orphan SAL. Replace the placeholders for SUBSCRIPTION-ID, LOCATION, and SUBNET-RESOURCE-ID with your specific details:

      az rest --method POST \
        --uri "/subscriptions/<SUBSCRIPTION-ID>/providers/Microsoft.Web/locations/<LOCATION>/purgeUnusedVirtualNetworkIntegration?api-version=2024-04-01" \
        --body "{'subnetResourceId': '<SUBNET-RESOURCE-ID>'}"
   

   If successful, you should receive a response indicating that the unused virtual network integration has been purged.
2. Re-create and disconnect the integration: If the purge command does not resolve the issue, you may need to re-create the virtual network integration and then disconnect it:
   • Re-create the App Service plan and app using the same web app name as before.
   • Navigate to Networking on the app in the Azure portal and configure the virtual network integration.
   • After configuring, select the 'Disconnect' button.
   • Delete the App Service plan or app.
   • Update or delete the subnet or virtual network as needed.

If you still encounter issues after these steps, consider contacting Microsoft Support for further assistance.