Custom Post Types don’t show up in Tag Archive Page

Hi there,

you need to tell WordPress to include the CPT in the tag Archives.
A simple option is to use the pre_get_posts hook. Here is some PHP to do that:

function include_custom_post_type_in_tag_archive($query) {
    if (is_admin() || !$query->is_main_query() || !$query->is_tag())
        return;
    $query->set('post_type', array('post', 'custom_post_type'));
}
add_action('pre_get_posts', 'include_custom_post_type_in_tag_archive');

In the code, change the custom_post_type slug for your CPT.

Adding PHP:
https://docs.generatepress.com/article/adding-php/

Glad to hear that