Add page number in Word using VBA

Question

I am looking for hours for one of the simplest things to do (but with MS things are never simple...): How can I programmatically add in my Word footer 'Page #', using VBA ?
There are zillions of different ways on the internet but none is working. Just a couple of examples

This code fails at Fields.Add:

Sub pageNumber()
    ActiveDocument.Sections(ActiveDocument.Sections.Count) _
        .Headers(wdHeaderFooterPrimary).Range.Select
    With Selection
        .Paragraphs(1).Alignment = wdAlignParagraphCenter
        .TypeText Text:="Page "
        .Fields.Add Range:=Selection.Range, Type:=wdFieldEmpty, Text:= _
            "PAGE ", PreserveFormatting:=True
        .TypeText Text:=" of "
        .Fields.Add Range:=Selection.Range, Type:=wdFieldEmpty, Text:= _
            "NUMPAGES ", PreserveFormatting:=True
    End With
End Sub

This code doesn't allow me to add a word like 'page' before:

With ActiveDocument.Sections(1) 
 .Footers(wdHeaderFooterPrimary).PageNumbers.Add _ 
 PageNumberAlignment:=wdAlignPageNumberLeft, _ 
 FirstPage:=True 
End With

Any additional hint ?
Thanks.

Answer 1

OK, the following code finally works:

With objWord.ActiveDocument.Sections(Section)
    .Footers(wdHeaderFooterPrimary).Range.Text = vbTab & "Page "
    .Footers(wdHeaderFooterPrimary).PageNumbers.Add FirstPage:=True
End With