Troubleshooting Portable Object Localization in Blazor server app with .NET 6 - blazor-server-side

Question

Trying to configure portable object localization in Blazor server app with .NET 6 following instructions from video "ASP.NET Community Standup - Localizing the .NET Website" from minute 23:54 on, but I can't get it working.
At its simplest stage, the video recommends next steps:
append .AddViewLocalization() to Program.cs builder.Services.AddRazorPages() line.
add the line app.UseRequestLocalization() to Program.cs after app.UseRouting()
on any page (index.razor in my case) add #using Microsoft.AspNetCore.Mvc.Localization and #inject IViewLocalizer T
change any string into its localizable version as Hello, world! into #T["Hello, world!"]
But it throws a System.NullReferenceException in #T["Hello, world!"]
Any ideas? I could not find any further documentation for Po files in Blazor server apps
My Program.cs:
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using TestOrhard.Data;
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddRazorPages().AddViewLocalization();
builder.Services.AddServerSideBlazor();
builder.Services.AddSingleton<WeatherForecastService>();
var app = builder.Build();
if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseRequestLocalization();
app.MapBlazorHub();
app.MapFallbackToPage("/_Host");
app.Run();
My Index.razor:
#page "/"
#using Microsoft.AspNetCore.Mvc.Localization
#inject IViewLocalizer T
<PageTitle>Index</PageTitle>
<h1>#T["Hello, world!"]</h1>
Welcome to your new app.
<SurveyPrompt Title="How is Blazor working for you?" />