A fatal issue occurred during the DNS lookup process for servier.com.cn/CAA.
DNS response for servier.com.cn/CAA did not have an acceptable response code: SERVFAIL
An error occurred while attempting to lookup the TXT record on _acme-challenge.persona.servier.com.cn . Any resolver errors that the Let's Encrypt CA encounters on this record will cause certificate issuance to fail.
DNS response for _acme-challenge.persona.servier.com.cn/TXT did not have an acceptable response code: SERVFAIL