I got this issue sometimes on several domains.
When I try to issue an Certificate via Let’sEncrypt from my hoster it’s saying
The DNS zone contains an AAAA record, but the domain is not assigned an IPv6 address in Plesk.
When I check the domain’s AAAA Records with an external tool, I find some Records as well. However, I didn’t add any AAAA Record in Cloudflare for this domain.
Can someone tell me where I should have a look to resolve this error?