NetTalk Proxy server not working

I am trying to make my application work with Microsoft’s DevProxy (during development) to better work with API development using NetTalk WebClient - I can get the proxy working in the Demo application with 127.0.0.1 as ProxyServer and 8000 as ProxyPort, also setting SSLCertificateOptions.DontVerifyRemoteCertificateCommonName and SSLCertificateOptions.DontVerifyRemoteCertificateWithCARoot to true - but inside the Demo application it does send and receive the request - but in my own application, it just straight goes from GET to PageReceived with no error and no data - doesn’t even make the call at all.

Now the only difference I can still find is my application is Legacy and the Demo is ABC - this can’t be it, can it? The reason it works in one and not the other?