C# tls1.3 Exception: Cannot determine the frame size or a corrupted frame was received

Question

I want to test tls1.3, so i created a console app in VS 2019(Version 16.7.7) and the target framework is .NET Core 3.1.

My Program.cs

using System;
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Answer 1

At the moment the max version of windows 10 is version 20H2(OS Build 19042.630). The TLS1.3 server works well only when TLS1.3 server is enabled in regedit. But TLS1.3 client does not work even TLS1.3 client is enabled in regedit. At the moment TLS1.3 client only works in Windows 10 Insider Preview Build 20170.