I was able to resolve the issue (thanks to the experts here for the tips!).
This one runs from a Command button click event in Access VBA.
It reads the emails from the Inbox in WeeklyProceedings Mailbox and saves the XML attachments in C:\Users\Testing

Dim olApp As Object
Dim MYFOLDER As Object
Dim OlItems As Object
Dim OlMail As Object
Dim x As Integer
Dim strFile As String
Dim strFolderpath As String


Set olApp = GetObject(, "Outlook.Application")
If Err.Number = 429 Then
    Set olApp = CreateObject("Outlook.Application")
End If


strFolderpath = "C:\Users\Testing"
'On Error Resume Next


' Set the Attachment folder.
strFolderpath = strFolderpath & "\Attachments\"


    Set MYFOLDER = olApp.GetNamespace("MAPI").Folders("WeeklyProceedings Mailbox").Folders("Inbox")
     Set OlItems = MYFOLDER.Items


    For Each OlMail In OlItems
        strFile = OlMail & ".XML"
        strFile = strFolderpath & strFile
        If OlMail.Attachments.Count > 0 Then
            For x = 1 To OlMail.Attachments.Count
                OlMail.Attachments.item(x).SaveAsFile strFile
            Next x
        End If
    Next
    
Set MYFOLDER = Nothing
Set OlMail = Nothing
Set OlItems = Nothing
Set olApp = Nothing