A test authorization for cloud.sysmex-europe.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Error getting validation data
The current status as reported by the Let's Encrypt status page is Service Disruption as at 2021-04-14 06:29:07.888 +0000 UTC. Depending on the reported problem, this may affect certificate issuance. For more information, please visit the status page.
https://letsencrypt.status.io/