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ASP.NET Core web notification implementation

For the intranet company, I want to send to user web notification. This notification could be general (new feature in the intranet) or for a specific user (a task is ready to pick up or an import is completed).
I started to use SignalR but the user receives the notification only if the intranet is open. So, I'm looking around to implement a different web notification and I saw some posts:
https://blog.elmah.io/how-to-send-push-notifications-to-a-browser-in-asp-net-core/
https://labs.bawi.io/web-push-notifications-through-vapid-method-7d4d6927a006
https://www.tpeczek.com/2017/12/push-notifications-and-aspnet-core-part.html
https://webpushdemo.azurewebsites.net/
I can't find an end-to-end implementation in ASP.NET Core. On GitHub I found a few projects but again when I close the browser, I can't receive the notification.
I can't find any Microsoft documentation for that. Can you point me in the right direction please?
Update
The idea is:
Setting up a minimal PWA
Subscribe to Push Notifications
Send Push Notifications
Receive Push Notifications
Show Push Notifications

Create Push notifications for Xamarin.Android without using FCM

I'm creating a xamarin.forms application and have got most of the app completed. My only hickup is push notifications. I'm sending my notifications to the app using SignalR and a .Net Web API Server. I'm able to receive notifications while the app is running however, I can't see tutorials for push notifications while the app is asleep. I've checked out services as well. Thank you for you help in advance.

SignalR is not a push notification and there is a difference between them.The main difference is that in case of SignalR you have to keep an opened connection to your hub in order to receive events / signals. So if you want to receive notifications while the app is killed or in background SignalR is a wrong solution since it is technically impossible to keep your application always running on a mobile device. However, push notification can awake your application when it is killed or in background.
I would suggest to rethink your current solution instead of looking for hacks.

Setting up push notification for windows phone. MPNS and its role

I have read this:
http://msdn.microsoft.com/library/windows/apps/ff402558(v=vs.105).aspx
This is the API documentation of the push notification service I want to get pushes from: https://developers.podio.com/examples/push
How do I go about implementing push notifications with Podio if they do not support MPNS. It looks like (from the msdn documentation) that they will have to send the notifications to Microsoft Push Notification Service at stage 5.
Is there a way around this stage? Can I communicate directly with Podios PNS somehow? Why should Podio who are protected by Citrix have to send sensitive data through Microsoft's service when they have a service workflow of their own? I'm struggling to understand this!
Related documentation:
http://forums.wpcentral.com/windows-phone-8-guides-how-tos/234780-how-push-notifications-work-why-sometimes-they-might-not.html
EDIT
If I set up a service of my own that Microsoft's push notification service interacts with... I can then make interactions on behalf of Podio... Is this normal practice?... I'm assuming that the lag of double dosing requests is going to be pretty useless for something like a messaging application.
I noticed that Android seems to also now have a middle man service... But I assume that having the choice means large companies who do not want to make a handshake with a third party company do not have to?
http://developer.android.com/google/gcm/gcm.html

Push Notifications in windows 8 desktop app

Hey i have been developing a windows 8 desktop app using XAML and C#. I have to implement push notification functionality in it. But i cannot keep my database on cloud due to some security reasons. Is there any other solution so that i can keep my database inside my network only but still can write mobile service to implement push notifications. Any link or suggestion is welcome.

Typically in push notification scenarios there are three pieces:
App.
Cloud Service.
Push Notification Service
Where the app registers for notifications, passes the registration to the cloud service which can then use the PNS to send notifications.
However the Cloud Service component doesn't need to be in "the cloud" it can be anywhere the client app can connect to and send the registration. It's just a web service hosted somewhere, be in a cloud platform, your own hosting etc.

There is a company that provides this service for you for free called Notice Software. They provide push within apps at not cost and handle the cloud interaction etc. I think the product site is NativePush.com....also used UrbanAirship but not sure I want to pay that much! Frees always best :)

Push notification issues in C# for iPhone?

I have used the push notification in my app and I have used our own server, it communicates with the apple server. But the problem is, the notifications are queued in the apple server and it doesn't send any notification to the device.
In server side, they are using C# for push notification services and they have traced the value in that method "service.QueueNotification(alertNotification)". So always the notifications are in the QUEUE and it doesn't send any notification to the device.

I have solved the issue, i am testing the notification in the adhoc mode. The problem is, my developer account was expired so that the notification always in the queue from the apple server and it doesn't send any notification to the device. After that i have used some different valid accounts and it work's fine now.
Thanks!