Add a domain with existed ns1 name server

My domain previously has ns1 name server attachted to it. I did remove it then try to add my domain in netlify. However, there is an error keep showing:
“A DNS zone for this domain already exists on NS1” error trying to create DNS zone “”. How can I fix this?

Hi, @3dsigma. It appears you are running into this issue:

Please take a look over that support guide and then let us know if there any questions.