Xamarin forms WebView cookies cleared when app closed

I have Xamarin Forms WebView app for android. I'm able to use the app perfectly fine on first login. But if i re-open the app WebView cookies clear and user need to login again. I want that the user does not need to log in after they have logged in once, even if they close the application. Here is my code:

 var wbURL = "https://www.example.com/login/";
 webrowser.Source = wbURL;

On Android, cookies should be stored automatically, unless you delete them manually using a custom renderer.

For iOS, you can save cookies and restore them later on, something like this:

Save cookies (Call this method after the user is logged in, this code is placed into the WebView custom renderer):

public async Task SaveCookies()
{
    // For iOS < 10, cookies are saved in NSHTTPCookieStorage.sharedHTTPCookieStorage(), coojies should work withouth this
    if (!UIDevice.CurrentDevice.CheckSystemVersion(11, 0))
    {
        return;
    }

    try
    {
        var cookies = await Configuration.WebsiteDataStore.HttpCookieStore.GetAllCookiesAsync();
        var cachedCookies = cookies.Select(c => new Cookie(c.Name, c.Value, c.Path, c.Domain)
            {
                Secure = c.IsSecure,
                Version = Convert.ToInt32(c.Version)
            }).ToList();

            //TODO: Save the cachedCookies into app cache. You can create a service in the shared project
    }
    catch (Exception e)
    {
           
    }
}

Restore cookies (Call this in the WebView custom renderer OnElementChanged method):

var store = WKWebsiteDataStore.NonPersistentDataStore;
await RestoreCookies(store);

private async Task RestoreCookies(WKWebsiteDataStore store)
{
    // For iOS < 10, cookies are saved in NSHTTPCookieStorage.sharedHTTPCookieStorage(), coojies should work withouth this
    if (!UIDevice.CurrentDevice.CheckSystemVersion(11, 0))
    {
        return;
    }

    if (store == null)
    {
        return;
    }

    await ClearCookies(store);
    var storedCookies = //TODO: Retreive cookies from where you sotred them

    foreach (Cookie cookie in storedCookies)
    {
        await store.HttpCookieStore.SetCookieAsync(new NSHttpCookie(cookie));
    }
}

private async Task ClearCookies(WKWebsiteDataStore store)
{
    var cookies = await store.HttpCookieStore.GetAllCookiesAsync();
    if (cookies?.Any() ?? false)
    {
        foreach (NSHttpCookie cookie in cookies)
        {
            await store.HttpCookieStore.DeleteCookieAsync(cookie);
        }
    }
}

EDIT: If you have problems on Android as well, try this code in your WebView custom renderer:

 var cookieManager = CookieManager.Instance;
 cookieManager.SetAcceptCookie(true);
 cookieManager.AcceptCookie();
 cookieManager.Flush(); // Forces cookie sync