vicitocande.duckdns.org has an A (IPv4) record (83.55.31.67) but a request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address.
A timeout was experienced while communicating with vicitocande.duckdns.org/83.55.31.67: Get "http://vicitocande.duckdns.org/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://vicitocande.duckdns.org/.well-known/acme-challenge/letsdebug-test (using initial IP 83.55.31.67)
@0ms: Dialing 83.55.31.67
@10000ms: Experienced error: context deadline exceeded
A test authorization for vicitocande.duckdns.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
83.55.31.67: Fetching http://vicitocande.duckdns.org/.well-known/acme-challenge/QRHcs7JTZOGDyULPYFjM8AYozvIfmCGp1vzvNDirS5o: Timeout during connect (likely firewall problem)