More about AMSI integration with Exchange Server

Hi Sir
I've ran .\Test-AMSI.ps1 on Exchange 2016 CU21 but get below SSL/TLS connection error. Any idea? 

I'm sure AMSI is running and functional since CU21 upgrade on end of June. I'm keep follow related articles posted by Exchange Team. 

Test-AMSI : The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
At C:\Batch\AMSI\Test-AMSI.ps1:124 char:1
+ Test-AMSI
+ ~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException
+ FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Test-AMSI

If you are using Microsoft Defender then AMSI may be disabled or you are using a AntiVirus Product that may not be AMSI capable (Please Check with your AntiVirus Provider for Exchange AMSI Support)

Updated how to fixed. 
Add below script in front Function Test-AMSI section. 

function Test-AMSI {


if (-not ([System.Management.Automation.PSTypeName]'ServerCertificateValidationCallback').Type)
{
$certCallback = @"
    using System;
    using System.Net;
    using System.Net.Security;
    using System.Security.Cryptography.X509Certificates;
    public class ServerCertificateValidationCallback
    {
        public static void Ignore()
        {
            if(ServicePointManager.ServerCertificateValidationCallback ==null)
            {
                ServicePointManager.ServerCertificateValidationCallback += 
                    delegate
                    (
                        Object obj, 
                        X509Certificate certificate, 
                        X509Chain chain, 
                        SslPolicyErrors errors
                    )
                    {
                        return true;
                    };
            }
        }
    }
"@
    Add-Type $certCallback
 }
[ServerCertificateValidationCallback]::Ignore()