Permissions error creating rally milestone when using API Key - permissions

Question

I'm trying to create rally milestones from an external app using an API Key for credential authorization, but I get the warning "Not authorized to create: Milestone" whenever I run the following code:
DynamicJsonObject toCreate = new DynamicJsonObject();
toCreate["Name"] = "test";
CreateResult createResult = restApi.Create("milestone", toCreate);
I ran the same code with defects and other rally objects without any issues, and I am able to update existing milestones. However, I still can't figure out how to create new milestones.

Answer 1

Assuming that ApiKey belongs to a user that has write access to the intended workspace, this code using v3.0.1 of .NET toolkit creates a Milestone in a default project of that workspace:
class Program
{
static void Main(string[] args)
{
RallyRestApi restApi = new RallyRestApi(webServiceVersion: "v2.0");
String apiKey = "_abc123";
restApi.Authenticate(apiKey, "https://rally1.rallydev.com", allowSSO: false);
String workspaceRef = "/workspace/1234";
try
{
DynamicJsonObject m = new DynamicJsonObject();
m["Name"] = "some milestone";
CreateResult result = restApi.Create(workspaceRef, "Milestone",m);
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
}
UPDATE:
The issue can be related to the request's scope. See how this error is replicated and resolved using a browser rest client here.
An equivalent C# code:
class Program
{
static void Main(string[] args)
{
RallyRestApi restApi = new RallyRestApi(webServiceVersion: "v2.0");
String apiKey = "_abc123";
restApi.Authenticate(apiKey, "https://rally1.rallydev.com", allowSSO: false);
String projectRef = "/project/2222";
String workspaceRef = "/workspace/1111";
try
{
DynamicJsonObject m = new DynamicJsonObject();
m["Name"] = "some milestone xxxt";
m["TargetProject"] = projectRef;
CreateResult result = restApi.Create(workspaceRef, "Milestone",m);
m = restApi.GetByReference(result.Reference, "FormattedID");
Console.WriteLine(m["FormattedID"]);
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
}