Can't show comments template on custom post type

I have the exact same problem. I’ll let you know if I find something. If anyone else knows – please post a line =)

I found this:
<?php $withcomments = "1"; comments_template(); ?>
on: https://ryanflorence.com/getting-comments-to-display-on-home-page-of-a-wordpress-site/

It worked for me.

(don’t forget the ‘supports’ => array(‘title’, ‘editor’, ‘excerpt’, ‘thumbnail’, ‘comments’) when you register the post type – and don’t forget to turn on comments when you edit your post in admin)

This is good and work for me:
https://wpquestions.com/question/show/id/2678
and how to do that:
https://www.lancelhoff.com/enable-or-disable-comments-on-all-posts-in-one-step/