Give Email Priority over First Name

function js_sort_checkout_fields( $fields ) {
$fields[‘billing’][‘billing_email’][‘priority’] = 5;
$fields[‘billing’][‘billing_first_name’][‘priority’] = 15;

return $fields;
}
add_filter( ‘woocommerce_checkout_fields’, ‘js_sort_checkout_fields’ );

I used this code because when leaving out ‘billing_first_name’ it did not work either. I want to make it so that email address is the first checkout field.

TIA