No permission to access this resource. This most likely reflects a limitation on the identity of the Control Panel user corresponding to the API client. See Get started to make sure you have permission to access all the functionality you need.
The response's detail should clarify the problem.
This example shows a typical permissions error:
{
"type": "https://problems.luna.akamaiapis.net/papi/v1/http/forbidden",
"title": "Forbidden",
"detail": "The authorization token you provided does not allow access to this resource.",
"instance": "/papi/v1/properties?contractId=1-123452&groupId=12345",
"status": 403
}