Free slots (DNS for an existing domain) require payment


New Member
I have been using zoneedit's free DNS service for 15+ years without any interruption.
When I try to use "get DNS for an existing domain", I see "You have 3 free slots left", which matches my expectations.
However when I proceed, I get "DNS Zone 1 Credit / 1 month". No free option.
Invoice 590862.
Please advise how to get free DNS.