How to use multi async method in Windows Runtime Component (C#)

I want to migrate an async method into Windows Runtime Component.
CookieContainer cc = await utility.GetCookieContainer();
But the content of async method still contains async methods.
public async Task<CookieContainer> GetCookieContainer()
if (stsAuthToken != null)
if (DateTime.Now > stsAuthToken.Expires)
this.stsAuthToken = await GetMsoStsSAMLToken();
AuthCookies cookies = await GetAuthCookies(this.stsAuthToken);
CookieContainer cc = new CookieContainer();
Cookie samlAuthCookie = new Cookie("FedAuth", cookies.FedAuth)
Path = "/",
Expires = this.stsAuthToken.Expires,
Secure = cookies.Host.Scheme.Equals("https"),
HttpOnly = true,
Domain = cookies.Host.Host
cc.Add(this.spSiteUrl, samlAuthCookie);
Cookie rtFACookie = new Cookie("rtFA", cookies.RtFA)
Path = "/",
Expires = this.stsAuthToken.Expires,
Secure = cookies.Host.Scheme.Equals("https"),
HttpOnly = true,
Domain = cookies.Host.Host
cc.Add(this.spSiteUrl, rtFACookie);
this.cookieContainer = cc;
And even GetMsoStsSAMLToken and GetAuthCookies contain async methods...
How to migrate it?

Hi Matt,
I'm sorry for my unclear description.
My WinRT Component is for Javascript. If I use folloiong codes, error occurs.
public static async Task<bool> GetInternal(string url, string username, string password)
bool r = await AuthUtility.Create(new Uri(url), username, password);
return r;
The error is
SharePointWindowsRuntimeComponent.Common.GetInternal(System.String, System.String, System.String)' has a parameter of type 'System.Threading.Tasks.Task<System.Boolean>' in its signature. Although this generic type is not a valid Windows Runtime type,
the type or its generic parameters implement interfaces that are valid Windows Runtime types. Consider changing the type 'Task' in the method signature to one of the following types instead: Windows.Foundation.IAsyncAction, Windows.Foundation.IAsyncOperation,
or one of the other Windows Runtime async interfaces. The standard .NET awaiter pattern also applies when consuming Windows Runtime async interfaces. Please see System.Runtime.InteropServices.WindowsRuntime.AsyncInfo for more information about converting managed
task objects to Windows Runtime async interfaces.
Some articles said, Task<T> is not WinRT type and should be converted to IAsyncOperation<T>. Only stirng, int, bool, object, array of above types and some 'simple' type can be used. (The
related article)
Then I try to convert Task<bool>, but the codes don't work.
Above is why I ask this question.
If async method can be used in WinRT component directly, please let me know why I got above error.
Thanks.

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