List management users

{
  "users": [
    {
      "id": "string",
      "sub": "string",
      "email": "user@example.com",
      "username": "string",
      "provider": "string",
      "imageUrl": "http://example.com",
      "isAdmin": true,
      "lastLoginAt": "2019-08-24T14:15:22Z",
      "createdAt": "2019-08-24T14:15:22Z"
    }
  ]
}

{
  "error": "string"
}

{
  "error": "string"
}

{
  "error": "string"
}