Field "email" is not populated during Airlock Import creation

Describe the bug

I'm working with a deployment of AzureTRE and have installed Airlock Notifier. I was reviewing the JSON data used as input for Airlock Notifier. I could check that the structure is populated the following way:

{
  "event_type": "status_changed",
  "recipient_emails_by_role": {
    "workspace_researcher": [
      "researcher_1@domain.com",
      "researcher_2@domain.com",
      ...
      "researcher_N@domain.com"
    ],
    "workspace_owner": [
      "owner_1@domain.com",
      "owner_2@domain.com",
      ...
      "owner_N@domain.com"
    ],
    "airlock_manager": [
      "manager_1@domain.com",
      "manager_2@domain.com",
      ...
      "manager_N@domain.com"
    ]
  },
  "request": {
    "id": "11111111-2222-3333-4444-555555555555",
    "created_when": 1684400625.173648,
    "created_by": {
      "name": "Miguel Dasilva",
      "email": ""
    },
    "updated_when": 1684400746.058016,
    "updated_by": {
      "name": "Airlock Admin User",
      "email": ""
    },
    "request_type": "import",
    "files": [
      {
        "name": "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee/random_text_file.txt",
        "size": 0
      }
    ],
    "status": "approved",
    "business_justification": "Testing import"
  },
  "workspace": {
    "id": "kkkkkkkk-2323-5454-7777-1234567890ab",
    "display_name": "My workspace name",
    "description": "My workspace description"
  }
}

Checking the JSON returned, is it not expected that the email fields in created_byand updated_by should store the emails of the given users. I supposed that this email (just like the real name) is stored and retrieved from AAD.

I have been reviewing the code for the Airlock Notifier, and Airlock Processor, but couldn't find the code responsible for generating the JSON data. I could verify that messages are correctly sent through the Service Bus' topics (theses messages are generated by the Airlock Notifier).

Are those fields supposed to be empty? Or should they really store email addresses?

Steps to reproduce

1. Create an import request
2. Check the workflow runs for the Logic App responsible for sending notifications

Trace the Airlock Notifier/Processor path and the Logic App workflow that produces the JSON, then compare created_by and updated_by with the corresponding AAD user data. Confirm whether empty email fields are intended; if not, identify the responsible lookup or serialization point and verify the import-creation notification payload.