useEffect(() => {
    function GetPostSessionData() {
      let data = new FormData();

      data.append("box_id", "8c457cf6-e5d3-5549-9edf-2ad999f4f870");
      data.append("device_type", "83");
      data.append("source", "XYZ");


      const requestOptions = {
        method: "POST",
        body: data,
        header: { "Content-Type": "multipart/form-data" },
      };

      fetch(
       baseURl,
        requestOptions
      )
        .then((response) => response.text())
        .then((result) => console.log(result, "result >>"))
        .catch((error) => console.log("error>>", error));
    }
    GetPostSessionData()
  }, []);

response > Request is missing required form field ‘box_id’ result >>,

Am able to get correct response in Postman.
Url and other details are correct, am not sure am binding correct form data.
Suggest some Solution

I have also used axios with async await and all , it gives same response
“Request is missing required form field ‘box_id'”