I've been testing this package trying to get Bing-Client to work using 'npm run server', but getting error

[typoworx-de]

I've been trying to get bing-endpoint to work:

settings.js: {cut-off the essential}

bingAiClient.userToken: '16b1RjUjyY0hNo-hTtNp7LwyIcoc_1ZUB2kfxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
apiOptions.clientToUse: bing

Then I've used php to send post-request:
http://chatgpt4-bing-bridge.docker:3000/conversation
POST

{
  "message": "Who is Albert Einstein"
  // rest was documented optional or is clientId 'bing only' essential even if given in settings.js?!
}

Response I'm getting:

{
  "error": "null"
}