curl --request DELETE \
  --url https://your-instance.example.com/api/organizations/{organizationId}/conditional-fields/{fieldId} \
  --header 'Authorization: Bearer <token>'

{
  "error": "Expression validation failed",
  "diagnostics": {
    "issues": [
      {
        "message": "Unknown field `contact.country2`",
        "line": 1,
        "column": 22
      }
    ]
  }
}