www.kleos.ai has an AAAA (IPv6) record (2a01:7e01::f03c:91ff:fe08:e041) but a test request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address. You should either ensure that validation requests to this domain succeed over IPv6, or remove its AAAA record.
Get https://www.kleos.ai/.well-known/acme-challenge/letsdebug-test: read tcp [2600:3c03::f03c:91ff:fea2:6a56]:47178->[2a01:7e01::f03c:91ff:fe08:e041]:443: read: connection reset by peer
Trace:
@0ms: Making a request to http://www.kleos.ai/.well-known/acme-challenge/letsdebug-test (using initial IP 2a01:7e01::f03c:91ff:fe08:e041)
@0ms: Dialing 2a01:7e01::f03c:91ff:fe08:e041
@169ms: Server response: HTTP 301 Moved Permanently
@169ms: Received redirect to https://www.kleos.ai/.well-known/acme-challenge/letsdebug-test
@169ms: Dialing 2a01:7e01::f03c:91ff:fe08:e041
@338ms: Experienced error: read tcp [2600:3c03::f03c:91ff:fea2:6a56]:47178->[2a01:7e01::f03c:91ff:fe08:e041]:443: read: connection reset by peer
A test authorization for www.kleos.ai to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching https://www.kleos.ai/.well-known/acme-challenge/-CzQiU_Ouadns6_F9sOQktN7hGtw0AiC2W8jbtnQqhs: Connection reset by peer