I ran the following command using the certbot docker container:
certbot certonly --standalone --preferred-challenges http -d REDACTED --server=https://api.buypass.com/acme/directory

I got the following in the output:

Account registered

Requesting a certificate for REDACTED

An unexpected error occurred    
acme.messages.Error: about:blank   

I found the following in /var/log/letsencrypt/letsencrypt.log:
 

2024-01-03 23:27:35,313:DEBUG:acme.client:Received response:                                                                                                                                                                                                               [0/313]
HTTP 500
Content-Length: 89
Content-Type: application/json
Date: Wed, 03 Jan 2024 23:27:34 GMT
Mdc-Correlationid: dc024fe2-984b-4fa1-9d0b-68a1af7e0f0b
Vary: Accept-Encoding
X-Buypass-Internal-Error-Detail-Code: INTERNAL_SERVER_ERROR
Strict-Transport-Security: max-age=63072000

{"code":500,"message":"INTERNAL_SERVER_ERROR","details":"HTTP 500 Internal Server Error"}

I'm also getting errors with the Lego acme client.

Is there something wrong on the server side?