I am getting an unknown error when trying to create a Ad when using a creative from a instagram post. Why?

Endpoint: act_104022143076593/ads

Payload:

{
  "adset_id": "66068904561822",
  "name": "Nome do Anúncio",
  "status": "PAUSED",
  "creative": {
    "creative_id": "6606894525822"
  }
}

Error:

{
  "error": {
    "message": "An unknown error occurred",
    "type": "OAuthException",
    "code": 1,
    "error_subcode": 1346001,
    "is_transient": false,
    "error_user_title": "Validation Error",
    "error_user_msg": "A validation error occurred.",
    "fbtrace_id": "AJZDrMXtvI_zaoItsC66AT"
  }
}