I am trying to update the SP document library meta data using the below API call via postman. But getting the below error, it does not match what i am trying to achieve.

Please share thoughts on it,

POST - https://graph.microsoft.com/v1.0/$batch Valid bearer token But getting the below response

"body": {
                "error": {
                    "code": "invalid Request",
                    "message": "Files and folders should only be added to a Document Library via the One Drive API",
        }
    }   
        
        

My Sample request Body :

{
  "requests": [
    {
      "id": "1",
      "method": "POST",
      "URL": "/sites/xxxxx.sharepoint.com:/sites/testsplist:/lists/9b2e99d1-c067-4122-bcb5-b5b00c413153/items/",
      "headers": {
        "Content-Type": "application/JSON"
      },
      "body": {
        "Dept_No": "5Z3dd96869",
        "Case_Name": "CONNIE-ESBTest001",
        "Client": "Humane Treatment",
        "Open_Date": "02/24/2016",
        "Initial_Court_Date": "04/12/2016",
      }
    },
    {
      "id": "2",
      "method": "POST",
      "URL": "/sites/xxxxx.sharepoint.com:/sites/testsplist:/lists/9b2e99d1-c067-4122-bcb5-b5b00c413153/items/",
      "headers": {
        "Content-Type": "application/JSON"
      },
      "body":     {
        "Dept_No": "4Z4qq90233",
        "Case_Name": "BBB ",
        "Client": "Animal",
        "Open_Date": "02/16/2017",
        "Initial_Court_Date": "04/11/2017"
    },
    },
    {
      "id": "3",
      "method": "POST",
      "URL": "/sites/xxxxx.sharepoint.com:/sites/testsplist:/lists/9b2e99d1-c067-4122-bcb5-b5b00c413153/items/",
      "headers": {
        "Content-Type": "application/JSON"
      },
      "body": {
        "Dept_No": "0Z4uu803",
        "Case_Name": "ABIMALEK-ESBTest002",
        "Client": "Health",
        "Open_Date": "07/07/2020",
        "Initial_Court_Date": "10/21/2020"
      }
    }
  ]
}