WordPress Function to Add custom post types to archives page

function namespace_add_custom_types( $query ) {
if( is_category() || is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {
$query->set( 'post_type', array(
 'post', 'your-custom-post-type-here'
            ));
      return $query;
    }
}
add_filter( 'pre_get_posts', 'namespace_add_custom_types' );

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