@dotmitsu The Let's Encrypt staff is trying its best, see DNS problem: looking up A for xxx.domain.top: DNSSEC: DNSKEY Missing; no valid AAAA records found for xxx.domain.top - #31 by mcpherrinm. But please don't post "I also have this problem!" there, as the problem is well known already. You can follow that thread for new posts from the Let's Encrypt staff or monitor the incident at Let's Encrypt Status.
I'm also closing this thread in favor of the one I linked to prevent other "I'm also having this issue!" posts, which are not helpful in this specific case.