Excel VBA click on a link on a webpage - access denied

what I'm trying to achieve from Excel VBA is:

1. open a webpage and search for a specific form and input
2. fill the input and submit the form through a link tag
3. search the new webpage generated by that submitted form.

Tasks 1 is done, and I'm trying to figure out why i'm getting an error 'ACCESS DENIED -2147024891 error' when the link is clicked.

My code so far for 1 and 2 :

Dim http As New XMLHTTP60
Dim html As New HTMLDocument
Dim cp12Element As HTMLInputTextElement
Dim formElement As HTMLFormElement
Dim response As String

With http
    .Open "GET", "http://me.intra-dmu-13.dv.mes.reseau.intra/conformite/SoutienConformite/AcafWeb/AdrsGDI.asp?CP12=" & cp12, False
    .send
    
    If .Status <> 200 Then
        MsgBox "Error, the file number entered is invalid.", vbCritical
        Exit Sub
    End If
    
    response = StrConv(.responseBody, vbUnicode)
End With

html.body.innerHTML = response
html.getElementsByName("CP12").Item(0).Value = "AAAA010101A1"
html.getElementsByClassName("lien").Item(0).Click    <--- ERROR
' html.getElementsByName("fAdrs").Item(0).submit   <--- generate the same error

The form's name is 'fAdrs' and there is only 1 input 'CP12'. The form's method is POST.

The HTML code of the page :

              
     <tr>
       






CP12 :














SEARCH

The function DoSubmit just a call a validation function and then submit the form.

Any help would be gladly appreciated.