A test authorization for corp.uz to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
DNS problem: SERVFAIL looking up A for corp.uz
The current status as reported by the Let's Encrypt status page is Degraded Performance as at 2019-10-03 01:57:57.688 +0000 UTC. Depending on the reported problem, this may affect certificate issuance. For more information, please visit the status page.
https://letsencrypt.status.io/