Blazor HTTPS client server certificate doesn't work

Question

My Blazor client server solution took a lot of fussing to get the cert just to be recognized.

// These commands allow you to reset when needed
//dotnet dev-certs https --trust
//dotnet dev-certs https --clean
//dotnet dev-certs https --check

This command:

dotnet dev-certs https --trust 

does not work and it's been a long time since it has worked.

It creates a cert, but puts it here (untrusted):

dotnet dev-certs https --check 

This shows up as untrusted.

This forces a S.O. Search:

dotnet dev-certs https --trust

• This answer took me one step further

It said: copy the certificate with the ASP.NET Core HTTPS development certificate friendly name by copying from Current User > Personal > Certificates into Current User > Trusted root certification authorities.

I don't think simply copying it works, you have to export and then import to the proper store.

This resulted in this:

This finally allowed the cert to be read and processed by this code:

Note in the using command below you will want this store: 

StoreName.Root,StoreLocation.LocalMachine
and this:  509FindType.FindBySubjectName, "localhost"

X509Certificate2 GetCertificateFromStore()
{
    using (var store = new X509Store(StoreName.Root, StoreLocation.LocalMachine))
    {
        store.Open(OpenFlags.ReadOnly);
        PrintCertNames(store);
        var certs = store.Certificates.Find(X509FindType.FindBySubjectName, "localhost", false);

        if (certs.Count > 0)
        {
            var cert = certs[0];

            if (IsCertificateTrusted(cert))
            {
                return cert;   // Cert is returned here.
            }
        }
    }
}

Now the app doesn't display at all. Any tips on what to check and how to check things? Note I have my firewall code set to off.