Code to Enable Dashicons for Frontend Visitors in WordPress

/* Enable Dashicons Frontend Visitors */ 
add_action( 'wp_enqueue_scripts', 'wpflt_load_dashicons_front_end' );
function wpflt_load_dashicons_front_end() {
  wp_enqueue_style( 'dashicons' );
}

By default, WordPress shows its Dashicons only to logged in users. All icons used within the Dashboard belong to ‘dashicons’ font family. If you are using the same icons within your posts/ pages viewable to public, you should enable loading of Dashicons for non-admins.

Add the above code to your child theme’s functions.php. This will enable Displaying of Dashicons for your visitors.