Hi and thanks for the reply.
Yes, here is my code (which is called on init):
namespace Amp;
function add_amp_theme_support() {
add_theme_support('amp', [
'template_dir' => 'modules/blog/src/amp',
'available_callback' => 'is_singular',
'comments_live_list' => false,
]);
}
add_action('after_setup_theme', '\Amp\add_amp_theme_support');
I have 0.7.1 installed.