[Bug] Does not work inside Http DelegatingHandler in .NET MAUI Blazor

The following code works perfectly on Blazor WebAssembly but does not work in .NET MAUI Blazor:

[TransientService]
public class AuthorizationDelegatingHandler : DelegatingHandler
{
    private readonly ILocalStorageService _localStorage;

    public AuthorizationDelegatingHandler(ILocalStorageService localStorage)
    {
        _localStorage = localStorage;
    }

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        if (request == null)
        {
            throw new ArgumentNullException(nameof(request));
        }
        
       // This line perfectly works in Blazor WebAssebly app but does not work in .NET MAUI Blazor
        LoggedInUserInfo loggedInUserInfo = await _localStorage.GetItemAsync<LoggedInUserInfo>(LocalStorageKey.LoggedInUserInfo);

        if (loggedInUserInfo != null)
        {
            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", loggedInUserInfo.AccessToken);
        }

        HttpResponseMessage httpResponseMessage = await base.SendAsync(request, cancellationToken);

        return httpResponseMessage;
    }
}

The following line does work in any place of the .NET MAUI Blazor app but does not work inside AuthorizationDelegatingHandler:

 LoggedInUserInfo loggedInUserInfo = await _localStorage.GetItemAsync<LoggedInUserInfo>(LocalStorageKey.LoggedInUserInfo);

And throws the following error:

System.NullReferenceException: Object reference not set to an instance of an object.
[DOTNET]    at Microsoft.AspNetCore.Components.WebView.Services.WebViewJSRuntime.BeginInvokeJS(Int64 taskId, String identifier, String argsJson, JSCallResultType resultType, Int64 
[DOTNET] targetInstanceId) in Microsoft.AspNetCore.Components.WebView.dll:token 0x6000113+0x0
[DOTNET]    at Microsoft.JSInterop.JSRuntime.InvokeAsync[String](Int64 targetInstanceId, String identifier, CancellationToken cancellationToken, Object[] args) in Microsoft.JSInter
[DOTNET] op.dll:token 0x600003a+0x10a
[DOTNET]    at Microsoft.JSInterop.JSRuntime.InvokeAsync[String](String identifier, CancellationToken cancellationToken, Object[] args) in Microsoft.JSInterop.dll:token 0x6000038+0x0
[DOTNET]    at Microsoft.JSInterop.JSRuntimeExtensions.InvokeA
[DOTNET] sync[String](IJSRuntime jsRuntime, String identifier, CancellationToken cancellationToken, Object[] args) in Microsoft.JSInterop.dll:token 0x6000048+0xe
[DOTNET]    at Microsoft.JSInterop.JSRuntimeExtens07-16 00:29:47.884 I/DOTNET  (24839):    at Blazored.LocalStorage.BrowserStorageProvider.GetItemAsync(String key, Nullable`1 cancellationToke
[DOTNET] n) in Blazored.LocalStorage.dll:token 0x6000005+0x24
[DOTNET]    at Blazored.LocalStorage.LocalStorageService.<GetItemAsync>d__5`1[[MauiBlazor.Shared.Models.IdentityModels.LoggedInUserInfo, MauiBlazor.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].
[DOTNET] MoveNext() in Blazored.LocalStorage.dll:token 0x6000082+0x29
[DOTNET]    at MauiBlazor.Shared.Extensions.LocalStorageServiceExtensions.GetUserInfoAsync(ILocalStorageService localStorage) in D:\GitHub\CleanArchitecture\src\ClientApps\MauiBlazor.Shared\Extensions\Loc
[DOTNET] alStorageServiceExtensions.cs:line 19
[DOTNET]    at MauiBlazor.Shared.Common.AuthorizationDelegatingHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) in D:\GitHub\CleanArchitecture\src\ClientApps\MauiBlazor.Shared\Common\Authorizat
[DOTNET] ionDelegatingHandler.cs:line 30
[DOTNET]    at System.Net.Http.Ht
[DOTNET] tpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken) in System.Net.Http
[DOTNET]    at MauiBlazor.Shared.Services.UserService.LoginAsync(LoginModel loginModel) in D:\GitHub\CleanArchitecture\src\ClientApps\MauiBlazor.Shared\Services\UserService.cs:line 128
[DOTNET]    at MauiBlazorApp.Components.IdentityComponents.Log
[DOTNET] inComponent.HandleValidSubmitAsync() in D:\GitHub\CleanArchitecture\src\ClientApps\MauiBlazorApp\MauiBlazorApp\Components\IdentityComponents\LoginComponent.razor.cs:line 51

[chrissainty]

Ah apologies. I didn’t spot the service scoping. The issue here is that we register the service as scoped.

I’m going to add an additional method for registering services as transient which will solve this. No ETA right now though.

[chrissainty]

Closing as there’s been no further activity.