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Hi,
According to our records, the software client you're using to get Let's
Encrypt TLS/SSL certificates issued or renewed at least one HTTPS certificate
in the past two weeks using the ACMEv1 protocol. Here are the details of one
recent ACMEv1 request from each of your account(s):
User agent: synology_apollolake_918+ DSM6.2-23824 Update 6 (DDNS)
Hostname(s):
Request time:
Beginning June 1, 2020, we will stop allowing new domains to validate using
the ACMEv1 protocol. You should upgrade to an ACMEv2 compatible client before
then, or certificate issuance will fail. For most people, simply upgrading to
the latest version of your existing client will suffice. You can view the
client list at: https://letsencrypt.org/docs/client-options/
시놀로지 클라이언트에 내장된 ACMEv1 프로토콜 호환을 드랍하고 ACMEv2를 통해 들어온 챌린지 요청만 받겠다고 안내 메일이 와 있습니다
업그레이드 안하면 구버전 헤놀에서는 Let's Encrypt 인증서 발급이 불가능해질거같네요 | 
등록안내
https://m.clien.net/service/board/cm_nas/14436364
저도 몇일전에 적용해서 잘됩니다~~
파일 교체가 가능하다니 좋은 정보네요
감사합니다