woocommerce function issue with wc_add_notice - php

Question

Hello I am trying to add an error notice when this function is met if a user adds more than 1 item from tv series catergory the shipping method 'flat_rate:3' is removed from the shipping options, it works but I can not get the error notice to display to the user when this happens can you help please
add_filter( 'woocommerce_package_rates', 'hide_shipping_method_based_on_shipping_class', 10, 2 );
function hide_shipping_method_based_on_shipping_class( $rates, $package ) {
$categories = array('tv-series'); // Defined targeted product categories
$allowed_max_qty = 1; // Max allowed quantity for the shipping class
$shipping_rates_ids = array( // Shipping Method rates Ids To Hide
'flat_rate:3'
);
$related_total_qty = 0;
// Checking cart items for current package
foreach( $package['contents'] as $key => $cart_item ) {
if ( has_term( $categories, 'product_cat', $cart_item['product_id'] ) ) {
$related_total_qty += $cart_item['quantity'];
}
}
// When total allowed quantity is more than allowed (for items from defined shipping classes)
if ( $related_total_qty > $allowed_max_qty ) {
// Hide related defined shipping methods
foreach( $shipping_rates_ids as $shipping_rate_id ) {
if( isset($rates[$shipping_rate_id]) ) {
unset($rates[$shipping_rate_id]); // Remove Targeted Methods
}
}
}
return $rates;
{
if ( $allowed_max_qty > 1 ) {
wc_add_notice( '<strong>' . __( 'You are not allowed more than one TV Series on a Disc', 'woocommerce' ) . '</strong> ' . 'error' );
}
}
}