Trouble with API

I wish to obtain live quotes from a broker and this is the example that they gave me.
It works fine, However I wish to add more quotes(what I added is in bold)
It seems it only returns the first request in both cells.

Dim WithEvents quotes As SterlingLib.STIBook
Dim a As Integer



Private Sub CommandButton1_Click()
    Set quotes = New SterlingLib.STIBook
    Call quotes.RegisterForTopOfBookMsgs(UCase(Sheet1.Cells(2, 1)), "ARB")
    Call quotes.RegisterForTopOfBookMsgs(UCase(Sheet1.Cells(3, 1), "ARB")

End Sub
Private Sub quotes_OnSTIBookUpdate(structSTIBookUpdate As SterlingLib.structSTIBookUpdate)
               
     Sheet1.Cells(2, 2) = structSTIBookUpdate.fPrice
     Sheet1.Cells(3, 2) = structSTIBookUpdate.fPrice
               

End Sub

You are missing a parenthesis in the second call of the quotes

Call quotes.RegisterForTopOfBookMsgs(UCase(Sheet1.Cells(3, 1)), "ARB")

Also you will need to change the Ticker from ARB to any other valid ticker