ACME certificate renewal fails with TASK ERROR

Since a couple of days our PBS tries to renew its x509 cert. We configured it to use our ACME-PROVIDER with the same credentials we use everywhere else. Here is what happens. We get emails stating: Code: Proxmox Backup Server was not able to renew a TLS certificate. Error: connection closed before message completed Please visit the web interface for further details: When I try to generate a new…