Let's Debug

Test result for www.envisual.eu using http-01

www.envisual.eu has an AAAA (IPv6) record (2a02:40c0:1:2:7:0:d:ecaf) 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 http://www.envisual.eu/.well-known/acme-challenge/letsdebug-test: dial tcp [2a02:40c0:1:2:7:0:d:ecaf]:80: connect: permission denied

@0ms: Making a request to http://www.envisual.eu/.well-known/acme-challenge/letsdebug-test (using initial IP 2a02:40c0:1:2:7:0:d:ecaf)
@0ms: Dialing 2a02:40c0:1:2:7:0:d:ecaf
@78ms: Experienced error: dial tcp [2a02:40c0:1:2:7:0:d:ecaf]:80: connect: permission denied

Submitted May 27 08:41:29 2020. Sat in queue for 1ms. Completed in 7s. Show verbose information.