Loading config file for Blazor wasm application silently fails

I need to save a few variables in a modifiable config file. I made a json file in wwwroot and set it to "copy if newer". Confirmed, it is copied to wwwroot and is accessible via localhost:port/config.jsonBUT, my program.cs silently fails:

builder.Services.AddScoped(sp =>    {        var navigationManager = sp.GetRequiredService<NavigationManager>();        var baseUri = new Uri(navigationManager.BaseUri);        var httpClient = new HttpClient() { BaseAddress = baseUri };        return httpClient;    });builder.Services.AddScoped<Task<Configz?>>(async p =>    {        var httpClient = p.GetRequiredService<HttpClient>();        try        {            var ret = await httpClient.GetFromJsonAsync<Configz>("config.json"); //execution fails after this silently.            return ret; //this line or anything between these two is never hit.        }        catch (Exception ex)        {            Console.WriteLine($"Failed to deserialize config.json: {ex.Message}"); //wish I hit this line.        }    });

My Configz class:

public class Configz{    public string apiPortHTTP { get; set; }    public string apiPortHTTPS { get; set; }}

My Json:

{"apiPortHTTP": "7021","apiPortHTTPS": "7020"}

Any help would be appreciated, this is really frustrating.