Import comments from old to new website using Disqus

Hi,

I've tried to import all the comments from this website:
https://leiderschapstips.wordpress.com

to this new website:
http://onbewuster.nl (a Wordpress.org site)

Only at this page at the new site the comments don't show up:
http://onbewuster.nl/gratis-ebook

It should show the comments from this old website page:
https://leiderschapstips.wordpress.com/gratis-ebook-spiegelen/

The same problem between these two pages:
(old site) http://leiderschapstips.wordpress.com/
and
(new site)
http://onbewuster.nl/gratis-leiderschapstips

Any idea how i solve this?

Thanks in advance!

André