Iis 10 is not allowing user interface (requesting certificate)

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SQL

IIS

IIS-Express

IIS10

Using visual studio 2022 and IIS Express to write and modify a lot of code that requests a user to select a certificate. Using IIS Express works perfectly but when I run the site from within IIS manager the website does not prompt for the certificate. I currently have forms and Anonymous authentication enabled. I can turn on "Require SSL" in the SSL settings but this has nothing to do with my code and will not populate the box on the web form that will hold the selected certificate.

Any ideas on getting this to work with the Local IIS?

code that prompts for the certificate:

public static X509Certificate2 GetClientCertificate()
        {
            IntPtr ptr = IntPtr.Zero;
            X509Certificate2 certificate = null;

            var store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
            try
            {
                store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);

                if (store.Certificates != null && store.Certificates.Count > 0)
                {
                    if (store.Certificates.Count == 1)
                    {

                        certificate = store.Certificates[0];

                    }
                    else
                    {

                        var certificates = X509Certificate2UI.SelectFromCollection(store.Certificates, "Digital Certificates", "Select a certificate from the following list:", X509SelectionFlag.SingleSelection, ptr);

                        

                        if (certificates != null && certificates.Count > 0)
                            certificate = certificates[0];


                    }
                }
            }
            finally
            {
                store.Close();
            }

            return certificate;

        }
    }
}

the results of this certificate selection is hashed and stored in a dropdownlistbox until it is stored in a sql database.

What I have tried:

I have made various setting changes within the IIS manager but it does not produce the desired result. not sure if there is something I should change within the IIS Manager "Session State" (mode settings or cookie settings) or some other settings. I have looked in the IIS Logs and see aspxautodetectcookiesupport lines but I dont see any "crumbs" that would point to any specific thing I can test.

Of course if I could capture the certificate request that IIS makes when enabling the "require SSL" setting in IIS then I could use that instead of the code above, but not sure how to capture that certificate request.