Employee API to get the employee branch

I need to know the endpoint to get the employee branch field.  

This endpoint: {{testacuBaseUrl}}/Employee/C15315

Just gives these fields:

{

    "id": "35029378-2110-ec11-89fc-000d3ac574da",

    "rowNumber": 1,

    "note": {

        "value": ""

    },

    "EmployeeID": {

        "value": "C15315"

    },

    "EmployeeName": {

        "value": "Jason Olschewski"

    },

    "LastModifiedDateTime": {

        "value": "2023-10-05T17:28:43.78-06:00"

    },

    "Status": {

        "value": "Active"

    },

    "custom": {}

}

I’ve tried to expand the BAccount but it returns an error.

I am currently using Build 21.212.0039