A test authorization for o----o.de to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Error creating new order :: Cannot issue for "o----o.de": Domain name contains an invalid label in a reserved format (R-LDH: '??--')
Requests made to the domain
Request to: o----o.de/178.254.0.103, Result: [Address=178.254.0.103,Address Type=IPv4,Server=Apache,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://o----o.de/.well-known/acme-challenge/letsdebug-test (using initial IP 178.254.0.103)
@0ms: Dialing 178.254.0.103
@166ms: Server response: HTTP 404 Not Found
A and AAAA records found for this domain
o----o.de. 0 IN A 178.254.0.103
Order creation error
acme: error code 400 "urn:ietf:params:acme:error:rejectedIdentifier": Error creating new order :: Cannot issue for "o----o.de": Domain name contains an invalid label in a reserved format (R-LDH: '??--')
The IANA public suffix is the TLD of the Registered Domain
The TLD for o----o.de is: de
The current status.io status for Let's Encrypt
Operational