Not Receiving Callback after Create Call REST API Request

Question

Hi,

Steps to reproduce:

Send Create Call REST API Request to {endpoint}/calling/callConnections?api-version=2023-03-06 from Logic Apps:

{
  "callbackUri": "<LOGIC APPS REQUEST ENDPOINT URL WITH SAS>",
  "sourceCallerIdNumber": {
    "value": "<PHONE NUMBER>"
  },
  "targets": [
    {
      "kind": "phoneNumber",
      "phoneNumber": {
        "value": "<PHONE NUMBER>"
      }
    }
  ]
}

Received Response from Azure Communication Services (HTTP 201):

{
  "callConnectionId": "<CONNECTION ID>",
  "targets": [
    {
      "rawId": "<RAW ID>",
      "kind": "phoneNumber",
      "phoneNumber": {
        "value": "<PHONE NUMBER>"
      }
    }
  ],
  "callConnectionState": "connecting",
  "callbackUri": "<LOGIC APPS REQUEST ENDPOINT URL WITH SAS>",
  "sourceCallerIdNumber": {
    "value": "<PHONE NUMBER>"
  },
  "sourceDisplayName": "",
  "source": {
    "rawId": "<RAW ID>",
    "kind": "communicationUser",
    "communicationUser": {
      "id": "<ID>"
    }
  },
  "correlationId": "<CORRELATION ID>"
}

Result:

1. Call Is Made (Phone Rings)
2. Callback URL is NOT called

How can I troubleshoot this further?

Thanks!