Typekit Font in Customizer

Hi there,

I reviewed this post:

https://generatepress.com/forums/topic/typekit-woes/

And am not able get my Typekit font to show in customizer

I added this to my child theme's function.php file:

add_filter( 'generate_typography_default_fonts', 'tu_add_typekit_fonts' );
function tu_add_typekit_fonts( $fonts ) {
    $fonts[] = 'classico-urw';
    return $fonts;
}

But still does not display in customizer.

What step am I mising?