Remove Home Page URL from an App Registration using Graph Rest API

Question

I'm trying to remove a Home Page URL from an Azure App Registration using Graph Rest API following MS Doc https://learn.microsoft.com/en-us/graph/api/application-update?view=graph-rest-1.0&tabs=http

Graph Does not throw any exceptions when I am passing null. Returning 204. However, Home Page URL is not removed.

If I am passing empty string, Graph throwing exceptions which is valid .  

var updateApp = new Application
                {
                    Web = new WebApplication
                    {
                        HomePageUrl = null
                    },
                    
                };
 await graphClient.Applications[applicationObjectId].Request().UpdateAsync(updateApp);

Can someone help me how to remove existing Home Page URL using Graph in C#?

Answer 1

Note that, there will be a slight delay in Portal to reflect the changes after running the code.

I registered one Azure AD application and added sample Home Page URL as below:

To remove this existing Home Page URL using Graph in C#, I ran below code:

using Azure.Identity;
using Microsoft.Graph;
using Microsoft.Graph.Models;
using Microsoft.Graph.Models.ODataErrors;

var scopes = new[] { "https://graph.microsoft.com/.default" };
var clientId = "appId";
var tenantId = "tenantId";
var clientSecret = "secret";

var options = new ClientSecretCredentialOptions
{
    AuthorityHost = AzureAuthorityHosts.AzurePublicCloud,
};

var clientSecretCredential = new ClientSecretCredential(tenantId, clientId, clientSecret, options);

var graphClient = new GraphServiceClient(clientSecretCredential, scopes);

var updateApp = new Application
{
    Web = new WebApplication
    {
        HomePageUrl = null,
    },
};

try
{
    var result = await graphClient.Applications["appObjectId"].PatchAsync(updateApp);
    Console.WriteLine("Home Page URL removed successfully");
}

catch (ODataError odataError)
{
    Console.WriteLine(odataError.Error.Code);
    Console.WriteLine(odataError.Error.Message);
    throw;
}

Response:

When I checked the same in Portal after few minutes by refreshing the page, Home Page URL removed successfully in the application as below: