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Hi!
Native categories work only with posts. You can’t search for flip-pong like that, because it’s a custom post type.
I guess you’ll have to do a custom query, searching for “flip-pong” postype, and you’ll be able to add a category filter.

** Solution

/********************* Add flip book to post query ********************/
// Show posts of ‘post’ and ‘flip_pong’ post types on home page
function add_my_post_types_to_query( $query ) {
if ( !is_admin() && !is_preview() )
if ( (is_home() || is_category() || is_tag() || is_archive() || is_feed() ) && $query->is_main_query() )
$query->set( ‘post_type’, array( ‘post’, ‘flip_pong’ ) );
return $query;
}