Multiple local fonts - only one works

Hi,
Im trying to get multiple fonts to work for hours now. The problem I have, is that if I add multiple local fonts the way described here: https://generatepress.com/forums/topic/custom-fonts-how-to-add-multiple-fonts-and-how-to-limit-the-weights/
only the first font declared in my functions.php works.

<?php
/**
 * GeneratePress child theme functions and definitions.
 *
 * Add your custom PHP in this file. 
 * Only edit this file if you have direct access to it on your server (to fix errors if they happen).
 */

function generatepress_child_enqueue_scripts() {
	if ( is_rtl() ) {
		wp_enqueue_style( 'generatepress-rtl', trailingslashit( get_template_directory_uri() ) . 'rtl.css' );
	}
}

add_filter( 'generate_typography_default_fonts','tu_add_system_fonts' );
function tu_add_system_fonts( $fonts ) {
    $fonts[] = 'Lato'; /*only this one ist working*/
    $fonts[] = 'Reem Kufi';

    return $fonts;
}

They both show up in the typography system fonts dropdown menu, but the second one (reem kufi) doesnt changes the texts look to times new roman. If I change their order in the php(so reem kufi is declared first and then lato) reem kufi works, but the lato font stops to work. Thats why i think there is a problem in my php and not in my css.

Greetings from Germany

Elias