Get 2 Textboxes To Display Different Strings Based On Keypress

I have a Userform whose purpose it is to capture payment information, in particular Creditcard information. To this end it has (amongst other elements) 2 textboxes - textboxCardNr1 and TextboxCardnr2.

the User enters the cardnr in Textboxcardnr1 as, e.g. 4321098765432109. Through the code below I transform this into the more readable number
4321-0987-6543-2109. I capture the keypress instance to only allow numbers to be entered in this field and to simultaniously update TextboxCardNr2 with the keystrokes.

On exiting TextboxCardNr1 the content of TextboxCardNr2 is copied to the clipboard to be available for pasting on a secure website in the approriate field.

My problem is, that when the user makes a mistake and changes the number in TextboxCardNr1, those changes are not automatically mirrored in TextboxCardNr2.

I want the easy to read form of the card - with the dashes, to be saved. The website the user is pasting the content of TextboxCardnr2 to does not accept the number with dashes.

Private Sub TextBoxCardNr1_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)
Dim taste As String
Dim wert As String

taste = VBA.Chr(KeyAscii)
wert = Me.TextBoxCardNr1.Text

KeyAscii = 0
If taste = "0" Or taste = "1" Or taste = "2" Or taste = "3" Or taste = "4" Or taste = "5" Or taste = "6" Or taste = "7" Or taste = "8" Or taste = "9" Then If Not Me.TextBoxCardNr2.Text Like "################" Then
Me.TextBoxCardNr2.Text = Me.TextBoxCardNr2.Text & taste............................