Getting 401 while trying to connect to Prime REST API

• Trying to write a client for the Prime REST API in ASP.NET C#, but while trying to connect is showing a 401 Unauthorized exception.  Have  created a user and added him to the North Bound API group.  Trying to connect using the code below:

IgnoreBadCertificates(); // accepts untrusted certificates 

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(@"https://172.26.170.20/webacs/api/v1/data/AccessPoints"); 

string svcCredentials = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes("apiuser" + ":" + "apiuserpassword"));

req.Headers.Add("Authorization", "Basic " + svcCredentials);

WebResponse svcResponse = (HttpWebResponse)req.GetResponse();  // throws a 401

  The user needs to be in the Admin group, not North Bound API.  The request /webacs/api/v1/data/AccessPoints was also a problem.