Hi @dhruva81
I believe that’s because you didn’t pass the comment ID. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/acf_form/. So, it should be something like this:
$options = array(
// "99" is the comment ID
'post_id' => 'comment_99',
'fields' => array('field_5863c431084e6'),
);
acf_form($options);
Where “99” is the comment ID. To get the comment ID, kindly check this page: https://www.advancedcustomfields.com/resources/get-values-comment/.
I hope this helps 🙂