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I am trying to obtain the installation id of the client app/device after registering to the backend (web API hosted in Azure and using Notification Hub) for push notifications. There are multiple methods that give an installation id and I am not sure which is the correct one.

As I understand, the installation id is valid as long as the application stays installed on the device, if its deleted and reinstalled a new installation id is assigned to the device is this correct? If not please advise about the life cycle of the installation id.

private async Task SendRegistrationToServerAsync(NSData deviceToken)
 
 //this is the template/payload used by iOS. It contains the "messageParam"
 // that will be replaced by our service

 const string templateBodyAPNS = @"
 ""aps"" : 
 ""alert"" : ""$(messageParam)"",
 ""mutable-content"": 1
 ,
 ";


 var templates = new JObject();
 templates["genericMessage"] = new JObject
 
 "body", templateBodyAPNS 
 ;

 // send registration to web api hosted in Azure
 var client = new MobileServiceClient(MyApp.App.MobileServiceUrl);
 await client.GetPush().RegisterAsync(deviceToken, templates);

 //get the installation id (not sure if this is the correct way)
 Console.WriteLine("Installation id: " + client.InstallationId.ToString());
 

I think you are right.

According to https://blogs.msdn.microsoft.com/writingdata_services/2016/01/22/adding-push-notification-tags-from-an-azure-mobile-apps-client/#comments:

The installation ID is a GUID that is specific to an installed app on
a given mobile device, to the point that when you uninstall and
reinstall the app on the same device you get a new GUID.

And the installation ID can be obtained from the Mobile client API:MobileServiceClient.InstallationId;