Authentication using CSOM with Project Online

Question

How are we to connect to Project Online with CSOM? All the SDK articles do not include any type of authentication. So if we are trying to use the CSOM to list out projects, and I try to create a credentials object and pass that to the ProjectContext.Credentials,
how would this work with the Project Online solution? 
If I try to use the standard network credentials, I get "(403) Forbidden" when I pass in my onmicrosoft.com account and password for credentials. I am the admin on my instance.
So a little help on understanding how to connect remotely to Project Online via CSOM would be great.
Here is a sample PowerShell script I am using. Same result in C# too:
Add-Type -Path 'C:\Sync\Microsoft EPM\Scripts\Microsoft.ProjectServer.Client.dll'
$credentials = Get-Credential "[email protected]"
$pwaPath = "https://bossnunyatest.sharepoint.com/sites/pwa"
$projContext = New-Object Microsoft.ProjectServer.Client.ProjectContext($pwapath)
$projContext.Credentials = $credentials
$projContext.Load($projContext.Projects)
$projContext.ExecuteQuery()
#Receive (403): Forbidden although I am admin
#This works fine against OnPrem
$projContext.Projects|select Id,Name
Thanks,
Kirk

Answer 1

Project Online is a part of SharePoint. Programmatically accessing Project Online uses the procedures that are described in the Office and SharePoint app development SDK; see
Build apps for SharePoint.  PowerShell can be used to administer Project Server 2013 (Windows
PowerShell cmdlets for Project Server 2013); I don't know of a way that PowerShell could be used with the CSOM for Project Online.
App development with the CSOM requires Visual Studio 2012 with the Office and SharePoint tools and other client components installed. See
How to: Set up an environment for developing apps for SharePoint on Office 365. The simplest way to start is to create a SharePoint-hosted app; the other app types require using
OAuth. The procedures for Project Online are essentially the same as described in How to: Create a basic SharePoint-hosted app, except you'd provide the URL of your PWA site
instead of the URL for SharePoint, and instead of the SP.ClientContext, you use
$(document).ready(function () {
var projContext = PS.ProjectContext.get_current();
var pwaWeb = projContext.get_web();
... and in the Default.aspx page, set a reference to PS.js, e.g.
<script type="text/javascript" src="/_layouts/15/ps.debug.js"></script>
Jim Corbin [MSFT]