tokyo-jp.z-sched.com has an A (IPv4) record (13.114.96.101) 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 tokyo-jp.z-sched.com/13.114.96.101: Get http://tokyo-jp.z-sched.com/.well-known/acme-challenge/letsdebug-test: context deadline exceeded
Trace:
@0ms: Making a request to http://tokyo-jp.z-sched.com/.well-known/acme-challenge/letsdebug-test (using initial IP 13.114.96.101)
@0ms: Dialing 13.114.96.101
@10000ms: Experienced error: context deadline exceeded
A test authorization for tokyo-jp.z-sched.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://tokyo-jp.z-sched.com/.well-known/acme-challenge/0mt_yaZSt9jb5i4b-cIA1VJdH1sYQMXDwq7B1bJORCs: Timeout during connect (likely firewall problem)