Blazor中的MSAL（Microsoft身份验证库）可能无法正确请求所需的访问令牌范围。要解决此问题，您可以手动在代码中指定所需的访问令牌范围。

下面是一个代码示例，展示如何在Blazor中使用MSAL并请求特定的访问令牌范围：

@page "/secure"
@using Microsoft.AspNetCore.Components.WebAssembly.Authentication
@using Microsoft.Graph
@inject GraphServiceClient GraphClient
@inject RefreshTokenService TokenService

Sign In
Sign Out

@if (initializing)
{
    
Loading...
}
else if (context == null)
{
    
You are not signed in.
}
else
{
    
Welcome, @context.User.Identity.Name! You have access to the following scopes:
    

        @foreach (var scope in context.Scopes)
        {
            
@scope
        }
    
}

@code {
    private bool initializing = true;
    private RemoteAuthenticationState authState;
    private AuthenticationState authStateFromModal;
    private IAccessTokenProvider TokenProvider;
    private GraphServiceClient graphClient;
    private AuthenticationResult context = null;

    protected override async Task OnInitializedAsync()
    {
        TokenProvider = (IAccessTokenProvider)TokenService;
        graphClient = GraphClient;
        authState = await TokenProvider.RequestAccessToken();
        context = await TokenProvider.RequestAccessToken(new AccessTokenRequestOptions
        {
            Scopes = new[] { "user.read", "mail.send" }
        });
        initializing = false;
    }

    private async Task SignIn()
    {
        authStateFromModal = await TokenProvider.RequestAccessToken(new AccessTokenRequestOptions
        {
            Scopes = new[] { "user.read", "mail.send" }
        }, authState);
        context = authStateFromModal.GetAuthenticationState();
        StateHasChanged();
    }

    private async Task SignOut()
    {
        await TokenProvider.ClearCache();
        context = null;
        StateHasChanged();
    }
}

在上面的代码中，我们在OnInitializedAsync方法中使用MSAL的RequestAccessToken方法请求所需的访问令牌范围。在这种情况下，我们请求user.read和mail.send访问令牌范围。

创建AuthConfig.cs文件 并添加以下代码：

public const string ClientId = "";
public const string Authority = "https://login.microsoftonline.com/";
public const string RedirectUri = "";
public const string GraphUri = "https://graph.microsoft.com/v1.0";

请将 "your-application-client-id"，"your-directory-tenant-id" 和 "your-application-redirect-uri" 替换为您的应用程序的相关信息。

在您的服务中注册以下内容：

builder.Services.AddMsalAuthentication(options =>
{
    options.ProviderOptions.Cache.CacheLocation = "localStorage";
    options.ProviderOptions.DefaultAccessTokenScopes.Add("user.read");
    options.ProviderOptions.DefaultAccessTokenScopes.Add("mail.read");
    options.ProviderOptions.DefaultAccessTokenScopes.Add("openid");
});

然后您需要在Startup.cs中启用并配置SPA服务，以使应用程序能够使用身份验证。

app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app