SignalR Health Checks do not work with Azure SignalR

What happened: We tried implementing SignalR health checks for our Azure SignalR resource(s), but no matter inputs we tried with the Xabaril .AddSignalRHub(...) method, we always got a 403 Forbidden response, an exception, and an unhealthy health check result.

What you expected to happen: We expect the library to provide some way to verify a healthy Azure SignalR endpoint/hub/resource through either providing the Access Key or proper bearer token as part of the hub connection.

Things that do not appear to work:

• Using a direct URL after attaching the signalR hub as an endpoint:

app.UseEndpoints(endpoints => endpoints.MapHub<NotificationHub>("/Notification"));

services.AddHealthChecks()
    .AddSignalRHub("https://myapp-signalr.service.signalr.net/notification", "signalRTest1");

• Using a direct URL after attaching the signalR hub as an endpoint:

ServiceProvider sp = services.BuildServiceProvider();
var tokenManager = sp.GetService<ITokenManager>();

AuthenticatedCredentials credentials = tokenManager.RetrieveCredentials(myAppAuthSettings)
    .GetAwaiter()
    .GetResult();

 HubConnection connection = new HubConnectionBuilder()
    .WithUrl("https://myapp-signalr.service.signalr.net/notification", options =>
    {
        options.AccessTokenProvider = () => Task.FromResult(credentials.AccessToken);
    })
    .Build();

 services.AddHealthChecks()
    .AddSignalRHub("https://myapp-signalr.service.signalr.net/notification", "signalrTest2");

Remaining questions:

1. Is Azure SignalR supported by Xabaril AspNetCore.Diagnostics.HealthChecks?
2. If I have my Azure SignalR Connection string, is there some way I can use that or the pieces therein to activate the health check without resulting in a 403? (e.g. “Endpoint=https://myapp-signalr.service.signalr.net;AccessKey=2xo7Pgaj6EVGkF8TbMQCOAeZ4AwH2r8/aFQ9+7r87B2=;Version=1.0;”)

• .NET Core version: 3.1
• Microsoft.Extensions.Diagnostics.HealthChecks: 3.1.5
• AspNetCore.Healthchecks.SignalR version: 3.1.1
• Microsoft.Azure.SignalR: 1.4.3

Additional Question/Consideration: @ChrisProlls logged issue #524 that implies that a uri of https://mydomain.com/hub would allow one to create a signalR health check, but does such a method not work for something like Azure SignalR where an access key or bearer token authentication is required?