Same issue here - apple does not detected changed/updated ssl certs after successful initial verification. As I understand from the documentation, it should be enough to just replace the certs on the site with new ones and apple should detect the new certs and automatically revalidate the domain - it just never happens.. If I manually revalidate the domain (that means, download the new validation "key" and make it accessible on our webserver to apple) it instantly succeeds. It really seems that the automatic revalidation process ist broken..

we've got the same issue here - initial verification process passes without any issues but the reverification just never happens. SSL Certs have been renewed but apple just never gets aware of that.