When a domain name resolves to multiple hosts at the same time, the SSL certificate cannot be created. https://github.com/acmesh-official/acme.sh/wiki/dnsapi https://github.com/acmesh-official/acme.sh/wiki/DNS-alias-mode Example My domain domain.com My servers Server1 111.111.111.111 Server2 222.222.222.222 Resolves api.domain.com A 111.111.111.111 api.domain.com A 222.222.222.222 Result Both Server1 and Server2 create certificates