EXCEL VBA AND API

I HAVE A VBA CODE BUT ITS NOT COMUNICATING WITH THE BULKSMS PROVIDE

Private Sub SMS_Click()
    Dim wb As Workbook
    Dim ws1 As Worksheet, ws2 As Worksheet
    Dim lastRow As Long, i As Long
    Dim HTTPReq As Object
    Dim successCount As Long
    Dim Message As String
    Dim APIToken As String
    Dim APIEndpoint As String
    
    ' Set API token and endpoint
    APIToken = "137|gkEBLgZmliFUSQy1FrdwQYHx8qXOWmQ7WRuT4llO "
    APIEndpoint = "https://bulksms.talksasa.com/api/v3/sms/send"
    
    ' Initialize HTTP request object
    Set HTTPReq = CreateObject("MSXML2.XMLHTTP")
    
    ' Initialize success count
    successCount = 0
    
    ' Set the workbook and worksheets
    Set wb = ThisWorkbook
    Set ws1 = wb.Sheets("StudentsBiodata")
    Set ws2 = wb.Sheets(Me.ComboBox7.value & "_" & Me.ComboBox9.value & "_" & Me.ComboBox8.value)
    
    ' Iterate through each row with data in column B starting from row 6 in ws2
    lastRow = ws2.Cells(ws2.Rows.Count, "B").End(xlUp).Row
    For i = 6 To lastRow
        ' Check if column B is not empty
        If Not IsEmpty(ws2.Cells(i, "B")) Then
            ' Construct the message body for each row
            Message = "Dear Parent," & vbCrLf & "Results for " & Me.ComboBox9.value & "_" & Me.ComboBox8.value & ":" & vbCrLf & _
          " NAME - " & ws2.Cells(i, "C").value & vbCrLf & _
          " ENG - " & ws2.Cells(i, "D").value & " " & ws2.Cells(i, "E").value & vbCrLf & _
          " KISW - " & ws2.Cells(i, "F").value & " " & ws2.Cells(i, "G").value & vbCrLf & _
          " MAT - " & ws2.Cells(i, "H").value & " " & ws2.Cells(i, "I").value & vbCrLf & _
          " BIO - " & ws2.Cells(i, "J").value & " " & ws2.Cells(i, "K").value & vbCrLf & _
          " PHY - " & ws2.Cells(i, "L").value & " " & ws2.Cells(i, "M").value & vbCrLf & _
          " CHEM - " & ws2.Cells(i, "N").value & " " & ws2.Cells(i, "O").value & vbCrLf & _
          " HIST - " & ws2.Cells(i, "P").value & " " & ws2.Cells(i, "Q").value & vbCrLf & _
          " GEO - " & ws2.Cells(i, "R").value & " " & ws2.Cells(i, "S").value & vbCrLf & _
          " C.R.E - " & ws2.Cells(i, "T").value & " " & ws2.Cells(i, "U").value & vbCrLf & _
          " H/SCI - " & ws2.Cells(i, "V").value & " " & ws2.Cells(i, "W").value & vbCrLf & _
          " AGRI - " & ws2.Cells(i, "Z").value & " " & ws2.Cells(i, "AA").value & vbCrLf & _
          " COMP - " & ws2.Cells(i, "AB").value & " " & ws2.Cells(i, "AC").value & vbCrLf & _
          " B/ST - " & ws2.Cells(i, "AF").value & " " & ws2.Cells(i, "AG").value & vbCrLf & _
          " MEANGRADE - " & ws2.Cells(i, "AK").value & vbCrLf & _
          " POS - " & ws2.Cells(i, "A").value
          

                ' Send SMS request
                HTTPReq.Open "POST", APIEndpoint, False
                HTTPReq.setRequestHeader "Authorization", "Bearer " & APIToken
                HTTPReq.setRequestHeader "Content-Type", "application/json"
                HTTPReq.setRequestHeader "Accept", "application/json"
                HTTPReq.Send "{""recipient"":""" & ws2.Cells(i, "AN").value & """," & _
                              """sender_id"":""TALKSASA""," & _
                              """type"":""plain""," & _
                              """message"":""" & Message & """}"
                ' Introduce a delay of 1 second between SMS requests
                    Application.Wait Now + TimeValue("00:00:01")
                ' Check response status
                If HTTPReq.Status = 200 Then
                    successCount = successCount + 1
                Else
                    MsgBox "Failed to send SMS to ", vbExclamation
                End If
            Else
                MsgBox "Phone number not found for row " & i, vbExclamation
            End If
        
        ' Create a new Word document
Dim WordApp As Object
Set WordApp = CreateObject("Word.Application")
WordApp.Visible = False

Dim WordDoc As Object
Set WordDoc = WordApp.Documents.Add

' Add the message to the Word document
WordDoc.Content.Text = Message

' Save the Word document as PDF
Dim FilePath As String
FilePath = "C:\Users\USER 14\Documents\New folder (2)\" & ws2.Cells(i, "C").value & ".pdf"
 ' Specify the file path where you want to save the PDF
WordDoc.ExportAsFixedFormat OutputFileName:=FilePath, ExportFormat:=17 ' 17 represents PDF format

' Close the Word document
WordDoc.Close False

' Quit Word application
WordApp.Quit
    Next i
    
    ' Display success message
    MsgBox "SMS Sent successfully to " & successCount & " recipients!", vbInformation
    ' Assume Message contains the text you want to print as a PDF



End Sub GIVES SUCCES MESSAGE BUT WONT SEND THE SMS