I am trying to display some error messages in case some conditions are not met when using wp_insert_post. However, it the admin_notice doesn’t seem to trigger.

Here’s the example I have:

    add_action( 'wp_insert_post', 'automate_intercom', 10, 3);
    function automate_intercom($post_id, $post, $update) {

        if($post->post_status == 'publish' && $post->post_type == 'help-center') {
            
            $someCondition = '';

            if($someCondition!== '') {

            }else{
                add_action( 'admin_notices', 'show_example_error' );


            }


        }
    }

    function show_example_error() {
        $class="notice notice-info";
        $message = __( 'Example error', 'admin_notice' );
        error_log("In admin notice ");
    printf( '<div class="%1$s"><p>%2$s</p></div>', esc_attr( $class ), $message); 
    }

Any ideas why it doesn’t trigger the admin_notices?