The problem is that http://duets.eu site is accessible only for visitors with DNSSEC validation turned: On. But if visitor connection is "Domain signatures Not validated" then they don't see website and browser shows: "err_name_not_resolved".
I have already tried:
1) Nameservers set to Default Godaddy; 2) DNSSEC settings in DNS controlpanel- empty. Cannot edit or add new, because "Error: DNSSEC modifications failed, Data management policy violation"; 3) Also tried Custom NS: Cloudfare, Google dns - result: still has dnssec problem.
How can I fix DNSSEC Authentication Chain? Is there any other problem? Please help!