Hello, 

You can fetch all the servers across all projects a user has access to in OpenStack.

Use a direct REST API call to authenticate and retrieve an unscoped token

{
  "auth": {
    "identity": {
      "methods": ["password"],
      "password": {
        "user": {
          "name": "username",
          "domain": { "id": "user domain" },
          "password": "user password"
        }
      }
    }
  }
}