Unable to obtain credentials: Empty optional

[BojanOD]

Request Details

Endpoint:

{{edc_base_url}}/management/v3/catalog/request

Headers:

{
  "Content-Type": "application/json",
  "X-Api-Key": "{{x_api_key}}"
}

Request Body:

{
  "@context": {
    "@vocab": "https://w3id.org/edc/v0.0.1/ns/"
  },
  "@type": "CatalogRequest",
  "counterPartyAddress": "{{edc_base_url}}/v1/dsp",
  "counterPartyId": "{{edc_provider_bpn}}",
  "protocol": "dataspace-protocol-http",
  "querySpec": {
    "offset": 0,
    "limit": 100
  }
}

Response
Status: 502 Bad Gateway
Body:

[
  {
    "message": "Unable to obtain credentials: Empty optional",
    "type": "BadGateway",
    "path": null,
    "invalidValue": null
  }
]

Expected Behavior

Getting a 502 Bad Gateway error with "Unable to obtain credentials: Empty optional" message. I'm not sure what I'm missing in order to have a successful fetch.