Mongo Cloud Manager API - Can connect on browser, cannot CURL into the API

From: Rafael Pólit <rafaelpolit@xxxxxxxxx>
To: mongodb-user <mongodb-user@xxxxxxxxxxxxxxxx>
Date: Fri, 6 May 2016 12:02:18 -0700 (PDT)
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Good afternoon friends.

Just begun using Cloud Manager, so bear with me if this is a newby question!

If I start a Chrome window and navigate to:
------------------
https://cloud.mongodb.com/api/public/v1.0/groups/<MY-GROUP-ID>/clusters
------------------
The usual user, password modal appears and I can then input my email 
address and my Public API Key and it logs the clusters correctly.

So, the URL is correct, the user name and password work!

If I then curl to that address:
-----------------------------------
curl -u "<MY-EMAIL-ADDRESS>:<MY-PUBLIC-API-KEY>" 
"https://cloud.mongodb.com/api/public/v1.0/groups/<MY-GROUP-ID>/clusters"
-----------------------------------

I get: 
------------
{
  "reason" : "Unauthorized",
  "error" : 401,
  "detail" : "You are not authorized for this resource."
}
--------------

What am I missing here?  I also tried with a NODEJS script:
-------------
var https = require('https');

var options = {
  hostname: 'cloud.mongodb.com',
  port: 443,
  path: '/api/public/v1.0/groups/<MY-GROUP-ID>/clusters',
  method: 'GET',
  auth: '<MY-EMAIL-ADDRESS>:<MY-PUBLIC-API-KEY>'
};

https.get(options, function(res) {
  res.on('data', function(data) {
    process.stdout.write(data);
  });
});
----------------

Same result!  I am loosing my mind here, any help would be very welcome! 
 Thanks.

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