ieApp.Visible = False not working when in a sub called from a userform

[Brendann]

Basic set up is I have a userform with a textbox & button. Put text in the box & click the button, It calls sub FNN_lookup(FNN). This sub have the "ieApp.Visible = False" line but internet explorer still ends up being visible. Any Ideas as to why? the sub has been tested without the userform and works as expected.
Any help greatly appreciated

Sub CommandButton1_Click()
Dim FNN
FNN = FNN_Box.Value
Call FNN_lookup(FNN)
End Sub

Sub FNN_lookup(FNN)
    Dim ieApp As InternetExplorerMedium
    Dim ieDoc As Object
    Dim ieTable As Object
    Dim clip As DataObject
   
    'create a new instance of ie
    Set ieApp = New InternetExplorerMedium
   
    'Change to true for debugging
    ieApp.Visible = False

    'go to google page, wait till ready then set required values, These have be changed slightly as site this is based for is internal only & this Sub works as expected just isnt hidden
    ieApp.Navigate "[URL]https://www.google.com.au/search?hl=en-AU&source=hp&q=" & FNN[/URL]
    Do While ieApp.Busy: DoEvents: Loop
    Do Until ieApp.ReadyState = READYSTATE_COMPLETE: DoEvents: Loop

'get the table based on the table’s id
    Set ieDoc = ieApp.Document
    Set ieTable = ieDoc.all.Item("gvTaskRes")
    
 'copy the tables html to the clipboard and paste to teh sheet
    If Not ieTable Is Nothing Then
        Set clip = New DataObject
        clip.SetText "" & ieTable.outerHTML & ""
        clip.PutInClipboard
        With Sheets("sheet1").Range("A1")
        .PasteSpecial "Unicode Text"
End With
        End If
'Close 'er up
   ieApp.Quit
   Set ieApp = Nothing
End Sub