SignalRClient.cs

protected override async Task OnInitializedAsync()
{
    var tokenResult = await _tokenProvider.RequestAccessToken();
    tokenResult.TryGetToken(out var token);

    _hubConnection = new HubConnectionBuilder()
        .WithUrl(_navigationManager.ToAbsoluteUri("https://localhost:6001/customer/orderhub"), options =>
          {
              options.AccessTokenProvider = () => Task.FromResult(token.Value);
          })
        .Build();

    _hubConnection.On("OrderBeingPrepared", async () =>
    {
        await GetOrderDetails();
        StateHasChanged();
    });

    _hubConnection.On("OrderPickedUpForDelivery", async () =>
    {
        await GetOrderDetails();
        StateHasChanged();
    });

    _hubConnection.On("OrderDelivered", async () =>
    {
        await GetOrderDetails();
        StateHasChanged();
    });

    await _hubConnection.StartAsync();
    await _hubConnection.InvokeAsync("WatchOrder", OrderId);
}