Let's Debug

Test result for sturtz.ml using http-01

sturtz.ml has an AAAA (IPv6) record (2604:99c0:8:2f60:223:24ff:fe08:581f) 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.
A timeout was experienced while communicating with sturtz.ml/2604:99c0:8:2f60:223:24ff:fe08:581f: Get "http://sturtz.ml/.well-known/acme-challenge/letsdebug-test": context deadline exceeded

Trace:
@0ms: Making a request to http://sturtz.ml/.well-known/acme-challenge/letsdebug-test (using initial IP 2604:99c0:8:2f60:223:24ff:fe08:581f)
@0ms: Dialing 2604:99c0:8:2f60:223:24ff:fe08:581f
@10000ms: Experienced error: context deadline exceeded
A test authorization for sturtz.ml to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://sturtz.ml/.well-known/acme-challenge/08VFuEiB1hbq-gQ5DSWj8M8vDWLmKMarRcXQQpqoeGs: Timeout during connect (likely firewall problem)

Submitted Aug 24 18:36:08 2020. Sat in queue for 2ms. Completed in 23s. Show verbose information.