Using cloudflare/dmarc-email-worker - Unknown extension

I've deployed https://github.com/cloudflare/dmarc-email-worker with the standard code, no modifications.
When triggering the worker via an email route I get the following:

{
  "outcome": "exception",
  "scriptName": "dmarc-email-worker",
  "diagnosticsChannelEvents": [],
  "exceptions": [
    {
      "name": "Error",
      "message": "unknown extension: ",
      "timestamp": 1709945220800
    }
  ],
  "logs": [],
  "eventTimestamp": 1709945220127,
  "event": {
    "rawSize": 6515,
    "rcptTo": "<redacted>",
    "mailFrom": "<redacted>"
  },
  "id": 1
}


Any thoughts on how I can get this to work properly? The file is being stored into R2 but nothing happens after that. Strange as I'm using the default code and instructions form the repo.
GitHub
DMARC reports processor using Cloudflare Workers and Email Workers - cloudflare/dmarc-email-worker
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