A DNS zone for this domain already exists on NS1 when trying to authorize

@luke Hello, I have just encountered this exact problem. I tried to add huangxin.dev to the DNS on Netlify, I own this domain since its creation (see https://ip.sb/whois/huangxin.dev) and can guarantee it hasn’t been added to Netlify, or NS1 before, but I still encounter this ‘domain is on NS1’ issue. Could you please look it up and see if you have any solutions. Thanks!