How Can I get all the users who has a certain role in Azure AD App Registration Using Dotnet/Blazor?

I used client credential flow in Blazor server application, this is my code. You can also use this code in .net core MVC/API applications. The nuget package I installed is <PackageReference Include="Microsoft.Graph" Version="4.43.0" /> Please pay attention to the version, the lateset version shouldn't be V4.x and using the latest version would require modify some of the code.

@page "/counter"
@using Azure.Identity;
@using Microsoft.Graph;

<PageTitle>Counter</PageTitle>

<h1>Counter</h1>

<p role="status">Current count: @currentCount</p>

<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>

<button class="btn btn-primary" @onclick="getUser">List users assigned to the enterprise application </button>
<input type="text" value="@userids" />


@code {
    private int currentCount = 0;
    private string userids = "null";

    private void IncrementCount()
    {
        currentCount++;
    }

    private async Task getUser()
    {
        var scopes = new[] { "https://graph.microsoft.com/.default" };
        var tenantId = "xxxx";
        var clientId = "xxx";
        var clientSecret = "xxx";
        var clientSecretCredential = new ClientSecretCredential(
                        tenantId, clientId, clientSecret);
        var graphClient = new GraphServiceClient(clientSecretCredential, scopes);
        var aa = await graphClient.ServicePrincipals["object_id"].AppRoleAssignedTo.Request().GetAsync();
        userids = "";
        for (var i = 0; i < aa.Count; i++)
        {
            if (aa.CurrentPage[i].PrincipalType == "User")
            {
                userids += aa.CurrentPage[i].PrincipalId + "===";
            }
        }
    }
}

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TinyWang