Unable to get Let’sEncrypt certificate

Hi,
I’m running a USC latest Version and I want to use LetsEncrypt certificates for https on apache2.
Unfortunately, I could not retrieve the cert :frowning:
Server ist available at port 80

Perhaps someone has any idea?

Log-Snip:

Fr 29. Jan 08:44:09 CET 2021
Refreshing certificate for following domains:
xxx.xxx.xxx
Parsing account key...
Parsing CSR...
Found domains: xxx.xxx.xxx
Getting directory...
Directory found!
Registering account...
Already registered!
Creating new order...
Order created!
Traceback (most recent call last):
  File "/usr/share/univention-letsencrypt/acme_tiny.py", line 197, in <module>
    main(sys.argv[1:])
  File "/usr/share/univention-letsencrypt/acme_tiny.py", line 193, in main
    signed_crt = get_crt(args.account_key, args.csr, args.acme_dir, log=LOGGER, CA=args.ca, disable_check=args.disable_check, directory_url=args.directory_url, contact=args.contact)
  File "/usr/share/univention-letsencrypt/acme_tiny.py", line 125, in get_crt
    authorization, _, _ = _do_request(auth_url, err_msg="Error getting challenges")
  File "/usr/share/univention-letsencrypt/acme_tiny.py", line 45, in _do_request
    raise ValueError("{0}:\nUrl: {1}\nData: {2}\nResponse Code: {3}\nResponse: {4}".format(err_msg, url, data, code, resp_data))
ValueError: Error getting challenges:
Url: https://acme-staging-v02.api.letsencrypt.org/acme/authz-v3/200000561
Data: None
Response Code: 405
Response: {
  "type": "urn:ietf:params:acme:error:malformed",
  "detail": "Method not allowed",
  "status": 405
}
Setting letsencrypt/status

Open port 443 additionally, otherwise the certificate cannot be validated.
Letsencrypt needs port 80 and 443