Microsoft is not supported. NET 4.8 Time stamp of the digital signature.

I cannot use WinCrypt to read the time stamps of digital signatures in.NET 4.8 files, I would like to ask is this Microsoft mechanism?

else if (unsignedAttribute.Oid.Value == WinCrypt.szOID_RSA_counterSign_USA)

                        {

                            foreach (var signedAttribute in signerInfo.UnsignedAttributes)

                            {

                                if (signedAttribute.Oid.Value == WinCrypt.szOID_RSA_signingTime_USA)

                                {

                                    Pkcs9AttributeObject obj = new Pkcs9AttributeObject(signedAttribute.Values[0]);

                                    SignedCms rfcTimestampMessage = new SignedCms();

                                    rfcTimestampMessage.Decode(obj.RawData);

                                    rfcTimestampMessage.CheckSignature(true);

                                    foreach(var timeStampSignerInfo in rfcTimestampMessage.SignerInfos)

                                    {

                                        foreach(var timeStampAttribute in timeStampSignerInfo.SignedAttributes)

                                        {

                                            if (timeStampAttribute.Oid.Value == WinCrypt.szOID_RSA_signingTime)

                                            {

                                                Pkcs9SigningTime signingTime1 = (Pkcs9SigningTime)timeStampAttribute.Values[0];

                                                strTimeStamp = signingTime1.SigningTime.ToLocalTime().ToString();

                                            }                                                    

                                        }

                                    }

                                }

                            }

                        }