datatables.net alerts Invalid Json Response. I can’t find anything wrong with the json [closed]

I am using Datatables.net to display results of an oracle query. Query works fine and I appear to be getting the right JSON output, but DataTables complains that my JSON is invalid. I have this javascript:

ajax: {
  url: "php/requests.php",
  type: "POST",
  dataSrc: ""
},
paging: false,
scrollY: '60vh',
scrollCollapse: true,
// note:  DataTables.render.number(thousandsSeparater,decimalSeparator,precision,[prefix ie '$'],[suffix])
columns: [
    { data: "Request_Id" },
    { data: "Description" },
    { data: "Requestor" },
    { data: "Request_Date" },
    { data: "Processed", className: "dt-right", render: DataTable.render.number(',', '.', 0) },
    { data: "Processed_Rate", className: "dt-right", render: DataTable.render.number(',', '.', 1) },
    { data: "Pending", className: "dt-right", render: DataTable.render.number(',', '.', 0) },
    { data: "Succeeded", className: "dt-right", render: DataTable.render.number(',', '.', 0) },
    { data: "Success_Rate", className: "dt-right", render: DataTable.render.number(',', '.', 1) }
    { data: "Failed", className: "dt-right", render: DataTable.render.number(',', '.', 0) },
],
order: [0, 'asc']

requests.php gets called as expected when the page loads and this json string is output:

[
    {
        "Request_Id": "10082",
        "Description": "test",
        "Requestor": "[email protected]",
        "Request_Date": "27-AUG-25",
        "Processed": 354,
        "Processed_Rate": 69.00584795321637,
        "Pending": 159,
        "Succeeded": 354,
        "Success_Rate": 100,
        "Failed": 0
    }
]

(as copied from Edge/developer tools/network/response )

this is the message that pops up:

What am I missing?