Power Automate - One Drive for Business Convert File has stopped working

I use this to convert files to PDF. It has worked with no issues for several years.

Yesterday it started timing out and now today it says PDF is not a supported format.

Furthermore the action still shows PDF as an option in Power Automate designer.

What is going on here?

Yesterday I started getting the following error:

{
  "error": {
    "code": 502,
    "source": "power-apis-usgov001-public.azure-apihub.us",
    "clientRequestId": "398fccdc-02e7-4d27-969b-b947a40b833a",
    "message": "BadGateway",
    "innerError": {
      "status": 502,
      "message": "Timeout calling WRS where service endpoint Url=https://excelcs.osi.office365.us/document/export/pdf",
      "source": "api.connectorp.svc.ms"
    }
  }
}

And now today the error has changed to:

{
  "status": 406,
  "message": "Conversion of this file to PDF is not supported. (invalidFileFormat / Error from Office Service. Url=https://excelcs.osi.office365.us/document/export/pdf HttpCode=UnsupportedMediaType)",
  "source": "api.connectorp.svc.ms"
}