Let's encrypt, blazor and Azure Linux Web App

I'm trying to add certificate with let's encrytp to my Blazor Server App that is hosted in a linux azure web app.

My issue is, that the path /.well-known/acme-challenge redirect to my Index page so when I try to create my certificate, I have an error.

Do you know how to achieve this with blazor ?

EDIT :

After following the link from @Yan, the folder still not accessible ( in dev & production)

Here the configuration :

 public static class AcmeChallengeResponderExtensions
{
    private const string WellKnownFolder = @".well-known";
    private const string WellKnownRequestPath = @"/.well-known";
    private const string AcmeChallenceFolder = @"acme-challenge";


    public static IApplicationBuilder UseAcmeChallengeResponder(this IApplicationBuilder app)
    {
        var rootFolderPath = Directory.GetCurrentDirectory();

        var root = new DirectoryInfo(rootFolderPath);
        if (!root.Exists)
            throw new ArgumentException("The provided folder does not exist");

        var wellKnownFolder = root.CreateSubdirectory(WellKnownFolder);
        var acmeChallenge = root.CreateSubdirectory(Path.Combine(WellKnownFolder, AcmeChallenceFolder));

        app.UseStaticFiles(new StaticFileOptions
        {
            RequestPath = new PathString(WellKnownRequestPath),
            FileProvider = new PhysicalFileProvider(Path.Combine(rootFolderPath, WellKnownFolder)),
            ServeUnknownFileTypes = true,
        });

        return app;
    }
}