aspnetcore: ApiAuthorization does not work after upgrading to .NET 5

Describe the bug

I am using .NET Core API Authorization since 3.1 which was working fine until I upgraded my project to .NET 5. After updating, I have been getting NullReferenceException

To Reproduce

ConfigureServices method from Startup.cs

services.AddDbContext<ApplicationDbContext>(options =>
                    options.UseInMemoryDatabase("Databaase"));

services.AddDefaultIdentity<ApplicationUser>()
                .AddEntityFrameworkStores<ApplicationDbContext>();

services.AddIdentityServer()
                .AddApiAuthorization<ApplicationUser, ApplicationDbContext>();

services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
                .AddJwtBearer(options =>
                {
                    options.RequireHttpsMetadata = false;
                    options.SaveToken = true;
                    options.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuer = true,
                        ValidateIssuerSigningKey = true,
                        ValidIssuer = configuration["Jwt:Issuer"],
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["Jwt:SecretKey"])),
                        ValidAudience = configuration["Jwt:Audience"],
                        ValidateAudience = true,
                        ValidateLifetime = true,
                        ClockSkew = TimeSpan.Zero // Override the default clock skew of 5 mins
                    };
                    //services.AddCors();
                });

Configure method from Startup.cs

app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();

DbContext public class ApplicationDbContext : ApiAuthorizationDbContext<ApplicationUser>

DbContext Constructor public ApplicationDbContext(DbContextOptions options, IOptions<OperationalStoreOptions> operationalStoreOptions, ICurrentUserService currentUserService, IDateTime dateTime) : base(options, operationalStoreOptions) { _currentUserService = currentUserService; _dateTime = dateTime; }

Exceptions

NullReferenceException as: Object reference not set to an instance of an object. Microsoft.Extensions.DependencyInjection.ConfigureApiResources.GetApiResources()+MoveNext() Microsoft.Extensions.DependencyInjection.ConfigureApiResources.Configure(ApiAuthorizationOptions options)

Further technical details

• ASP.NET version 5.0.0
• Visual Studio 2019 (16.8.2) on Windows 10 OS dotnet-info.txt